{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421622783",
    "entityType": "Track",
    "nonce": "0x1674565f7fcd56697af604fe6592ab1b8b08eb65aafc4f8278b271446b19e6be",
    "signature": "0x3c3a7a3c226ca19c654da495a1e5662a1696d8993050c70b2c688f675679be7e254f5c28b0a76a1a354978e6efe32df4ebdc29541d62ca5dfc26f1347d4dd0c51c",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}