{
  "manageEntity": {
    "action": "Save",
    "entityId": "1413812508",
    "entityType": "Track",
    "nonce": "0x916031b76ed0e2ef3b8144e1b6a5706f3627cd47b0bdc5b0510518f9a4c39f4f",
    "signature": "0xe052bc084f40bb51dc23ed0c4fa4d94bec33d841ef2c1d7410be2a623be9ba1f167eeacbe3ed272e6ecd1ab4294dbd6e330a3083c7ddd28d1322e799b085ff431c",
    "signer": "0x9668338741f0B2F3bcc87715a755f7FFACcEd1D6",
    "userId": "945181225"
  }
}