Supersordo was a Chilean post-hardcore band, formed in 1991 and separated in 1997. The genre of the band is a hybrid of "punk and metal", classified as rock, punk, metal and post-hardcore, with noise
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 0x4d0da8c31fef289d633093ee81fe01da32fd5b4fc16a956a40fd6c4b96ac40b2. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91c395de-26aa-41a4-83d1-7b9f7c57ad2d.json and https://artists.proofprofile.net/proofs/artist/91c395de-26aa-41a4-83d1-7b9f7c57ad2d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.