{
  "manageEntity": {
    "action": "Save",
    "entityId": "552943026",
    "entityType": "Track",
    "nonce": "0xce41d8a433d26c6c6f0d4ec4640316418dae8497d100f813070f06aa510476fd",
    "signature": "0x3a2b0aa719e7663bbc7c99df4b16d866f7e178f402cf6443dad02660d5edcb0153aa2751db0e9a76cd221a96e35e215048d350f0ad10d92755df0501b509da8a1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}