{
  "manageEntity": {
    "action": "Save",
    "entityId": "691521518",
    "entityType": "Track",
    "nonce": "0x963a6bc92fffac7b6bcce7b8e721cef13565bfa272e0b0f2a739dbf5d957fe9b",
    "signature": "0x8447106f1c0203d1e2ebe7ff0ca2d41f495be3ee0970bcedb75832fd841c98ec1d1941f5e65f608eab4ba05df9fec3120b86ed54f6dc320458ff73ebc6b10d5b1c",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}