{
  "manageEntity": {
    "action": "Save",
    "entityId": "1582057745",
    "entityType": "Track",
    "nonce": "0x75eaae0b010ac28df27d1f8130acc3b026ebb4023468f0b0a242071529fcd2f1",
    "signature": "0xa656102b79619d2e81748cc6355ead329e94f89ee1bd64576e3c9ef9d15cb8ec7bc8c29ee39afa332d0eb42258299adba702a03eff0ecd9033ad6b93b93769691b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}