John Fisher (c. 19 October 1469 – 22 June 1535) was an English Catholic prelate who served as Bishop of Rochester from 1504 to 1535 and as chancellor of the University of Cambridge. He is honoured as
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795f9d4365ee89097b8fcee07587174e61e88fc93658e0418c715b95b261d526. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9a63d20-3830-4476-9d25-09fd7a26daac.json and https://artists.proofprofile.net/proofs/artist/b9a63d20-3830-4476-9d25-09fd7a26daac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Le nozze di Figaro / Act 3: Recit: "Signor..."
Orchestra dell'Accademia Nazionale di Santa Cecilia
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2577240cfd6d25bd8f5e5cecfbf29f5dfcd77225afc0a01172d87544c9cf01a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079813180.
Don Giovanni / Act 1: "Alfin siam liberati"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6f86cc3c0b2a739ee4823f3e0a3a36871d96e6e2023eb3795961007a6315dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079813230.
L'elisir d'amore / Act 2: "Come sen va contento"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd8a2c5c361fb15cccaaab511905b23c70db50cfa6924361e16e15491fe3550. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079813300.
Le nozze di Figaro / Act 1: "Cosa stai misurando"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4417f9b51bb55dbc478781005fafb7e5905ab9cf6f440aa96583bd624156f792. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079813140.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
Le nozze di Figaro / Act 1: "Or bene, ascolta, e taci"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89485791809943ba80ea5cb27d0c8d63c6c94e1a976775a6b63c40322917f75c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079813160.
Così fan tutte / Act 2: "Passegiammo anche noi.."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38007c4cb4db1015f147c1ac7e0e17e76fe10d99efc4c65e8d3fca3b8cc6b7c9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079813210.
Il barbiere di Siviglia / Act 1: Recit: "Ebben, signor Figaro?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2194f902aeb7974c0562243185ad70cca49da67985527c91f0a0ae5e65eeeaf9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079813260.