{
  "manageEntity": {
    "action": "Save",
    "entityId": "66729",
    "entityType": "Track",
    "nonce": "0x0ac61762fb0127b602eebd01601f5dd8f674db37f38fbb772dc67da1b738cae3",
    "signature": "0xf9c0cb755b8c242c2cc6445cda46f55682f74ba4f8140dc049efdb6a7a5bee7108b45b6313458ccb24163dabb903554d557b8ed7f3e09e59a611536bef68a7651b",
    "signer": "0x5A2b21D1d4240B0d6eC130512D4b578aec735125",
    "userId": "862976792"
  }
}