{
  "manageEntity": {
    "action": "Save",
    "entityId": "66471714",
    "entityType": "Track",
    "nonce": "0x70f63279a0929d52a5e4527400cbe792a29fc1ab578ad54771bed6c728d2c385",
    "signature": "0xb7991150933e6567d3ff1b28ecd2824dad022817554a882d09e2f47aa14b9cf42406e670750414a2e09aec6884697e0b48195f369c378ff47283311938c39ff71b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}