{
  "manageEntity": {
    "action": "Save",
    "entityId": "623546514",
    "entityType": "Track",
    "nonce": "0xecbb5b3e27ab5267c617d2a7fc807e7676d7c10b55b76dea2f0fb3c6e4ea34f3",
    "signature": "0x9968cbce291fcbb9ceab2550b695791332acfea4d44cbae50a2ef5631d7c0b4b7098d14c7925af9112b1fece0d1c1e52b6d878fa7f4df22f730ad0cb6eb05fc51b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}