{
  "manageEntity": {
    "action": "Save",
    "entityId": "1591537825",
    "entityType": "Track",
    "nonce": "1792303114515564051",
    "signature": "0x26bae3c4454bc9bb41eab945249f3ae3a392884a11744e851591eec4c2f7bfe8322479f1bc7c3bf4815fa64ede412be82408f35584671d64d08b2965a84bdf3c1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}