{
  "manageEntity": {
    "action": "Save",
    "entityId": "974968106",
    "entityType": "Track",
    "nonce": "0x76c2a83ce8cb058f940e6b1eecc3291a6bf39974b0cabfa7e675d71ba20cb855",
    "signature": "0x495b5a99cdc5ee21218ea99d62252b19bad6eec6ab49dc9dbbb0128085f04df4750f75c187a54d5ed17368bdb4aea0f7ff1a05113b659d7f831eb5c7f4a3599b1c",
    "signer": "0x5D4848bCf5c4abA1a0Fdf2B61408c9e4288aDb0E",
    "userId": "305415280"
  }
}