{
  "manageEntity": {
    "action": "Save",
    "entityId": "573264269",
    "entityType": "Track",
    "nonce": "0xfb98778653871006353a9e30bc71eb44ffb7bb2e1acec5b02c6fd2c5a6b0280f",
    "signature": "0xa5416e08cbf0c145e88ebd5de3fe897dca419d89a4813302a8898c4b7f494a68071eb056d9321ee5ab08b209de3d8e4493db4bd0f92695b9c64210bf714cb7ba1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}