{
  "manageEntity": {
    "action": "Save",
    "entityId": "541166",
    "entityType": "Track",
    "nonce": "0x8e8b2747119087a1eaf89b34537dcbbb15d22aba8b04ebf81f9e88db2e535fe4",
    "signature": "0xcf1a33c1e19c0f40b031b63cd2c87f9032367e47fff73fce7fb02b513207150f0d2fb70ab4e608be92c83632f6b207ec1572b49aefd9a7f6f1174b9cb0dc6acc1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}