{
  "manageEntity": {
    "action": "Save",
    "entityId": "510361388",
    "entityType": "Track",
    "nonce": "0x9a8f2563a02c6b2bf095c7751f955059dc4445818b73b62d314163a202717a78",
    "signature": "0xacb77357b758a56c227810285e8b4168ce57f6534742734ae6b7473c2cff94da76050f90c5290c9aebb8816b74b1c52c5e0b5da737b2967db18465817fa184401c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}