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 0xa1d2d2d5d950bb38b199dc5dcc4db914bf3ff517b3b78a110a845fbb3e0f2dca. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a5dc51d-d098-461c-bf8b-fd617fecd760.json and https://artists.proofprofile.net/proofs/artist/4a5dc51d-d098-461c-bf8b-fd617fecd760.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Les Contes d'Hoffmann / Prologue: "Va pour Kleinzach...Il était une fois à la cour"
Offenbach: Les Contes d'Hoffmann - Highlights
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 0x3ab885c6d9c3641ae24b2e3085763a5fc922c930b897d7f010001f8202984472. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBF077140502.
Les Contes d'Hoffmann / Act 1: Voici les valseurs!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98ba0695783dfcf0fe2e37a90bc8d703b6679f05a00dfd1ec17d848806b2329. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/GBF077240016.
Les Contes d'Hoffmann / Prologue: Il était une fois à la cour d'Eisenach
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b690e871410edcc1b1b4fa5d35b685d60d230bc4c29bc95fbf7f25d3788af08. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBF077240005.
Les Contes d'Hoffmann / Act 2: Belle nuit, ô nuit d'amour
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ac2f31d288647dbfe0f074571c725ad2ccccd9219b9d62400b09cdef44f073. Chain 2 (Bitcoin): anchored in block 957056 (2026-07-07T15:15:30Z), 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/GBF077240017.
Les Contes d'Hoffmann / Prologue: Allons, allons mes enfants! Préparez cette salle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efff7abb918974ca428d54ebcb0d67f4587926f2eaddb63c21f8524b9b1ea07. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBF077240003.
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
Les Contes d'Hoffmann / Act 2: Amis! Amour tendre et rêveur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e58c96cff1408e9b4f7f7392f21310df733fd506af5b5ce471b67b72b67aeb. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/GBF077240018.
Les Contes d'Hoffmann / Act 1: Les oiseaux dans la charmille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2c804d531b9a62048def3a48cd1328e7570fb23463129ebd71fa64d56224c4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBF077240013.