{
  "manageEntity": {
    "action": "Save",
    "entityId": "1803336424",
    "entityType": "Track",
    "nonce": "0xea5dd76a60674d4856fa5d05d61c269bd805d76927de901b55b97b9215b51a0c",
    "signature": "0x2cfd14f76b9f6e20cd7a28b7bec057fe7d121e4e40f33574e1557a49a508884c4302ddc2e488e20c170e0a91ac26dd545d262d6557cb938c896d1f5237f778b91c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}