{
  "manageEntity": {
    "action": "Save",
    "entityId": "1553927983",
    "entityType": "Track",
    "nonce": "0x59493390c3d760ed6cf190c3e47b88dd4ba70fccd993771a0857c3f1f907f925",
    "signature": "0xce5a9c40842bc26fc4c87c69b45ceb115b1deb16c74744a40b7dfa8c3ae7db6710ca748cc8eb34118a3e5776942d0b82ac53c43ea6894ea23108654841c0c08f1b",
    "signer": "0x26Feee0AaDc0e2d8f7aBEd5cdb0bCD7D325F618d",
    "userId": "354535"
  }
}