{
  "manageEntity": {
    "action": "Save",
    "entityId": "143278",
    "entityType": "Track",
    "nonce": "0x205734d41f63bb00093e210e2ea24fbf976737937defc192dfae2c89b95cc2e1",
    "signature": "0xa50e1c3cb536f9cb9ad7e6643f9868f706976c3e0cd20218dd28e045358a2c3b160c1e26e5d0259f3dff85e7f3e819ace89b9f80d288c24027917d66b3b142211b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}