{
  "manageEntity": {
    "action": "Save",
    "entityId": "1252856210",
    "entityType": "Track",
    "nonce": "0xa1c28e3a8d0df1f9f200f305c1622937fdb11a276f1e70b41b5df76707c1bf6f",
    "signature": "0x0d9e467c2bd88b371867634cc981c79d5645fdec0f5c4813897f42f2e59fd1455c0f9811f55b561af6e63dce7e35a70dc4c0f2a23e64642e24a7eaac625c29f51c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}