{
  "manageEntity": {
    "action": "Save",
    "entityId": "800591",
    "entityType": "Track",
    "nonce": "0x87f6665c6af47130259e4786e233073632f3073fea8c86cd8ae11eb5ad6cb940",
    "signature": "0x1e36c66cb884c15f9f0e54c4dadd403b0a36a68fb2c7dc8d1ad8c7b72f30fe4f0fd383a229b7d0101e98a34fe2edae1e11dc7aa6186edbb92407f1dfb0f9790d1c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}