{
  "manageEntity": {
    "action": "Save",
    "entityId": "621737",
    "entityType": "Track",
    "nonce": "0xe2984b2d26ff620dc748707d6e962a552abda06ca32f34f99a993aca339d3ac1",
    "signature": "0xbf9c1a9de3f34e6e1ccfcd286f4dac1ab141c146b4d1ec1b7d3fc58424d3cd2c533990e6f908ab28c221561cb6d09554e938ff0a3677e37afcebff0922eaf7d81b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}