{
  "manageEntity": {
    "action": "Save",
    "entityId": "446873649",
    "entityType": "Track",
    "nonce": "0x27e6ceed96451b4da72da7acc000a3c8899d4e142fd631a1248f7cdbcb26af3a",
    "signature": "0xd195c02aa98b2d95c990d15461068e9a92fa456e5957cb45fcfcc4ac94bc4c3a5543fbd93ea2018bacb0c3dc06d1d74e4c5b9ad9fbdd44abb71726ebdd4fc56c1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}