{
  "manageEntity": {
    "action": "Save",
    "entityId": "650971",
    "entityType": "Track",
    "nonce": "0x64c55bc3521662ae0cc378f0e4f0ad55b332a675c2081607ba8b3a9ea841fef3",
    "signature": "0xc6d8e5cf11ad04cd95679c85b67cc63c32f780b9715945c4cafd419733087ba828391ee661c71affe17bb44bbbd2228da44d45cfc3bafbf9288a09d059c3db141b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}