{
  "manageEntity": {
    "action": "Save",
    "entityId": "771338164",
    "entityType": "Track",
    "nonce": "0xcf913ddad3daf67d89b4a9183df3d4f8c404bc6547675ae591696adb2bf2df2a",
    "signature": "0xff16d6f0193257be17de7f4a6227f2a733eec8673aafd8fafcae5d09fb6ce7593f9da4e1494502adc0b5a707ee26578f6b4857b91a5ec25b4550bfa43b85bbc11b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}