25band () is an Iranian music band originating from Mashhad, Iran. The band was formed in 2010 by Tamin (Tahmineh تهمینه) along with A-del (Adel عادل) as the vocalists. The name 25band means Tus, the
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20309718854c31f6cec816beec0fb4f36a11d8cad40774a95a5b5bfb42710e7. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0fa61901-03af-4c9d-a095-628f652686d2.json and https://artists.proofprofile.net/proofs/artist/0fa61901-03af-4c9d-a095-628f652686d2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.