{
  "manageEntity": {
    "action": "Save",
    "entityId": "1628493649",
    "entityType": "Track",
    "nonce": "0x3897a6816e3243f38bb4b3ae4f2197e2cf83ddae5f3ad9dbef594bc930401528",
    "signature": "0xfa4ef09ae2862a74f23bd3b5aad36485b40d688060d677e16b5b74224d10d0b044e062ef538694ece383445c36d69ad49c846acdbe1544d6e310d1fa776ed18e1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}