{
  "manageEntity": {
    "action": "Save",
    "entityId": "758212",
    "entityType": "Track",
    "nonce": "0xe86bac5567137443dd0ddc7e2cfcb44a5975ca5a03846a8851080e934f6ed205",
    "signature": "0xbebbd68bf2b64dc50fd9948509a45406b8f83348c9834cab1a8e3c57389a3ae67d01da7cdb0ea9e8fe6562fce991782c1ee03b7e70b60e5149a6c59dcfc56eca1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}