{
  "manageEntity": {
    "action": "Save",
    "entityId": "197617",
    "entityType": "Track",
    "nonce": "0xe143bd531a4d61e05994c50db2dddddf506d5eb97ca7edc1a7cee51023a8a4f3",
    "signature": "0x537094ffd00bff43fa30dfc4919a04957b41982349bd945a15ea0f930e5d111c7fa57dca112e8e0dd7db9e25303376c32bd9ea30e30e5a49b8f12059b57986261c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}