{
  "manageEntity": {
    "action": "Save",
    "entityId": "639624300",
    "entityType": "Track",
    "nonce": "0x580da26127c342b83589f0554af99faea7b4b71b7c9633f19bf11b5c89c6ea00",
    "signature": "0xd9148bb513b30ffbddaded2f0a75ba9ef0d767049b83d61c5f0a92d2102c491538bc05d5e54de24f42c16ecd9d406ddeb7d4c6bf78bfd2d6920643c96cd9e7591c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}