{
  "manageEntity": {
    "action": "Save",
    "entityId": "338249",
    "entityType": "Track",
    "nonce": "0xcaec68fab149531e93dfc58452ed9c7b5b0c4bab899ccd22df3f0bfc5d9c4ce1",
    "signature": "0x914d6063f6d506458f7f7a1a0354fa923af06de3f853f8615acee3b9f467ba9b68c3ac0bd56cd71bcfef5b4caccdfdb82669c1a471439109cf013dbe5ce608aa1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}