{
  "manageEntity": {
    "action": "Save",
    "entityId": "287436523",
    "entityType": "Track",
    "nonce": "0x518c81717fdf57ec5911511892f02293a4206a19ebbdb9c0cbff5bfdcf86de04",
    "signature": "0xa2791cfc05fb6ee5224f61d358521d13e0d285fbdfc74141eb3324ac4198e0ce559f75a20e0d6c75c83bb5fef34e204e7f99ef706b7784089727d8bcf03ea4b41b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}