{
  "manageEntity": {
    "action": "Save",
    "entityId": "1900901343",
    "entityType": "Track",
    "nonce": "0xc7750a6807712d346c48cffcd89f022ba87d7ce3f4c79c84473c2ab0a664d0f8",
    "signature": "0xf10e0ede9ddd8d62ef499b9a86c78c078f7fafc6d1c6e4bbc2352b69d712b2f43c7fc22cbbefeb8b81ac0075b78667a4b92d1a6daeae8dcd01571f4d7bf1395a1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}