{
  "manageEntity": {
    "action": "Save",
    "entityId": "339450",
    "entityType": "Track",
    "nonce": "1786422850820156666",
    "signature": "0x26f743bf516ea1995f8bc4f207370b498f0a7a5201edc272b10e89ef786b5e9c16ae1b271832da851d3034437211e0839069bfd18a4cf89edfd1070e9c888f311b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}