{
  "manageEntity": {
    "action": "Save",
    "entityId": "242807",
    "entityType": "Track",
    "nonce": "0x9d2f0fbb4e60f0e886b04cab46cab8fb0c986f8722596596f4a159974be7236a",
    "signature": "0x74ead82e281ecc90a2a909232c4d4d006c81f524bfdaac6eb8b9ab52f0890c3c4e9b3e3faaaba304ff1f3d63eb39a6d278c69f5bbdd149b84d4d4a867e728f2f1b",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}