{
  "manageEntity": {
    "action": "Save",
    "entityId": "823379710",
    "entityType": "Track",
    "nonce": "0x4084d273706c5b3fa98b2abfe7089d7d22f75d11245df94f83d76138aa7050ce",
    "signature": "0x290104da83d4351a607e399ae7b69a02a854e50cf7c57fac307eefbe88cf25ae294d5e72c6afc4249f7c2cf104ac215ea0b2b64cbbaff457fbffc2c8eae0e3381c",
    "signer": "0xc397C4709687C73dfCC135CDC077A82066147CFA",
    "userId": "552759720"
  }
}