{
  "manageEntity": {
    "action": "Save",
    "entityId": "487490289",
    "entityType": "Track",
    "nonce": "0x3a61dc2faecc430b4f8ab05977b4d016a4113c93a2860d92a1644990d470b187",
    "signature": "0x08af42c29fcb045cc75e18829b3d58f25a0d9a8e38171409cd1a85fbea418d2b3d58b6b252546429e7839b4020481a25f47d627763f7d56e638b82e107d86bfa1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}