{
  "manageEntity": {
    "action": "Save",
    "entityId": "1258869464",
    "entityType": "Track",
    "nonce": "0x4eefa2eb4ad069983e1aa54ee99b9ed67cc17eaa39a56a72fe4970cabdfc3c74",
    "signature": "0xf73bf15af236b3d252b388d29490562006a0ed4095ff3222c9f63e818ef9e89a6980c0eedb4fdb81bceccbe021da0217eb542bf881372e7ee0a12be7d40078561c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}