{
  "manageEntity": {
    "action": "Save",
    "entityId": "900683419",
    "entityType": "Track",
    "nonce": "0x7ed7403de726c4d12139dba96ff2920fa8c10c3d0aa6084786a63f313e18604c",
    "signature": "0x86b6d66e3bac02874743cfdbe746f924d387b2f0b91fb0c764747e2e1c2760723950786bbfc2fcd553801bb93c80fd76b2a37a8aedcd0ba00c2eff633cd391531c",
    "signer": "0x849938DF063059EbF6d907f55E72C083347C9343",
    "userId": "796529120"
  }
}