{
  "manageEntity": {
    "action": "Save",
    "entityId": "752745469",
    "entityType": "Track",
    "nonce": "0x20c0e1cf20ea27c7bb5d7cfa7dae8632253a2e835d6cefcd2ca30dc80a884b76",
    "signature": "0x4d31b32c73ece5d5354a0fa614162a8b727e73b8f40e150f5cdd56fa28f9b8ff060d09152aae30b48b2b4447724796eb7e6827b7b37c4fd2f5db9890faee1b021b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}