{
  "manageEntity": {
    "action": "Save",
    "entityId": "895247556",
    "entityType": "Track",
    "nonce": "0x8f2a5985faf9351ac7a166922f48c470352b8ffa13324adb73f37f17a54d200b",
    "signature": "0x59b1595ac91d06a6d24a7a13042f5c6db47c287a7bb3bddbdb3515def18225d06bf610f7026f11580ad0facef979bccb28ffde155849c493bccb2f308168fed91b",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}