{
  "manageEntity": {
    "action": "Save",
    "entityId": "223358706",
    "entityType": "Track",
    "nonce": "0x31307b8b47c52cc61cef8c7a761e517f4f58e35408aa91e9474c44aa79a302e6",
    "signature": "0xc1d5d03c8e5c4edc562ad9e02cac38234c9004720ac44651067de742e1a3de0f63d204dea27562950c5710b71e71ea6e230d9c0cba38beac02d009d55fa0113a1c",
    "signer": "0x9202FC2175aCc0910Bc89Ba04225BD27c83A507a",
    "userId": "524998459"
  }
}