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 0xec7a7541f0d3f4554283eb29b17c11493e81b55a83821a840bce39015a6a8e7d. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5500088e-7e57-4e54-a62c-2d2f704cebfc.json and https://artists.proofprofile.net/proofs/artist/5500088e-7e57-4e54-a62c-2d2f704cebfc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1cc3186eb20252664961bc7dbf258c01309f8b0cb1716fb8ce8623a96704c9. 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/TCAGN2256700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14f73801f640139352296665d0f85e774b0a0b3fda734d0d786ed41a191b887. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAGN2256795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc132ac60631c51c2a2235479539312f91fe35b6965093b9ea201e3ce768f051a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCAGN2260046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4438a3b0dcf5d5646303e6ec1b5925909b9e6d3d2fd88156623a0f69f461ec13. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/TCAIF2495801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb165d917938b044447e09fe0b01cdda616c9b44c29d01a2cba024cd9244772. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/TCAIC2493533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e4e6ec9f03113a251f4951f858a352470bf51acf85eebbc85236049a6622c5. 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/TCAHK2316968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c5375d45fa0ae417ca29cd9be2572f799421058862eac7b312a4ede2d97bf6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCAET2085494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e922c90b816b9fd41e5ebdcb3a7631804224cb61b5fd828aa80377d34fa3648. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCAEC1992217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbb7add9b9f9e8dfa82a84ae17258f7c2db63578648230cc1448a1f9fb6e1d7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAEC1992410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab796e06b8a2e76592df6573203378eed7fb30feca26694ef7af39c2c340439. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCACU1662852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec083621767a87e9a0f47ae97ac8be632fb42a779c26db2b594ecf6343693d33. 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/TCACO1656723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e43d19215d2866a6b27b271ca39e288015ea916ceb06ab33d2461b4ca86752. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCACO1651718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d711f89ae0e5f31e06adb19a26e002b2e9faf414f36c72d246015f6db634800. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCACO1651556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fd38f8b11342dcdd38fb608a21a7680550abf9e92e90f0de5c61f993aacc64. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAJO2515740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd2db1df57fd28acdeade4ba582fe1e5bc2a0b0eb14e4ed3538796fe1502de3. 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/TCAJL2558291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77670cb3ea734921c44f10c68e62ea985494353f62b77a00b59bf3f91b9c2a7c. 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/TCAIW2416534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e9b51672617ba7cb4287a996e7d881fdcf88ab5e0be70ed607f0f51c343a9c. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/TCAIQ2408879.