{
  "manageEntity": {
    "action": "Save",
    "entityId": "812929752",
    "entityType": "Track",
    "nonce": "0x216fd81f6e75c7699a8002f0ce0a0ea6a2859cf3dab52bf1f570d321c493333c",
    "signature": "0xb33c7f5cc3f96930410676b46091c43ed709c1012091489d66672b66e7fd03b7622d1dff596feff7626ff55b2addd26107a9c284cbbd8175f88a389e0bb1c7441b",
    "signer": "0x28Bbb53f14b48eE811b10fD56903fc4D922C6902",
    "userId": "625201833"
  }
}