{
  "manageEntity": {
    "action": "Save",
    "entityId": "1021516227",
    "entityType": "Track",
    "nonce": "1786500145116735435",
    "signature": "0xabf05f2c954e114713ccfbffcc09be095ec590cf3a3e447a8aaeeb2497e9b349194710e74f9f27b20cf5516e936e02cc0429d0e7b3b03ccccc04d213387b68961b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}