{
  "manageEntity": {
    "action": "Save",
    "entityId": "138271539",
    "entityType": "Track",
    "nonce": "0x05f1fc45cb45e19777173fd20db34660400d921495063a8355bb5e40e1a42ab6",
    "signature": "0x6c1f96494a3248c814ea905dc1576a544a760f58598f6b137c068db5a3f8668e729b63974354723a288b81c6a9e13d55bea642683e4d543c89cf32208e1c33381b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}