{
  "manageEntity": {
    "action": "Save",
    "entityId": "493261",
    "entityType": "Track",
    "nonce": "0xd7c09e17da5e9bb268ecbec11397113be00d34b26348fe012c8b2fd293c3b7e2",
    "signature": "0xc3b1e7392d8785ef7a0aec8a955bdb2f46f566f3302e5ab02452ebad4e8261cb25ad0409cbb5b1f7f4efd067ce28a41abc82f4191624ad6bdf12729e9cfa9e481c",
    "signer": "0x849938DF063059EbF6d907f55E72C083347C9343",
    "userId": "796529120"
  }
}