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 0x9e4f884fb4e8396ca8ac21430170d43fe22c887cfef69ae01d9c45f35caf7d43. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a889a559-eb5a-4cba-8200-c9bcd75e8b32.json and https://artists.proofprofile.net/proofs/artist/a889a559-eb5a-4cba-8200-c9bcd75e8b32.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 0xe1bfbb35644436112d5573d8aa6ab63c92694039629dee2abc0a2d588abafc09. 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/QZK6H2057793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4949341e0b0e436177600a15818bb69ebd6a2d2e6a4a482d182696c08a4125. 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/QZFYX1973794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43173a2424e02461863ae31c89d44f87b7aec0bd541d0d9b48fb18e0d856bc92. 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/QZHN92247059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8f2ab605fc6fd6d97cf06aaafac007a499925e43ef7e9619755dd95073c07f. 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/QZFYZ2080048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c48b485df9e476cec9df4bf6a944d1bbed7cb11b1686beee6c9d5f4071a515. 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/QZHN92247060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee28d40f3911770861d4ddb2908b3400f2914ac32184052ed908a773754342c. 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/QZHN31918487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1582362e1a325ee11c4d176301911c068de8d5041903776db514d2a3bd5a6d. 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/QZDA82042944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0e7912621c126ea84b509e8d2de9bba571fee8b6a1880f7d4d3b9628f56926. 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/QZDA42113608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90cbfc0883ac0689acbc73eb48e841cfec8947d9beb6106b93b349ff1beb7763. 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/QZHN92247061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0e7912621c126ea84b509e8d2de9bba571fee8b6a1880f7d4d3b9628f56926. 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/QZDA42113608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bfbb35644436112d5573d8aa6ab63c92694039629dee2abc0a2d588abafc09. 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/QZK6H2057793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1582362e1a325ee11c4d176301911c068de8d5041903776db514d2a3bd5a6d. 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/QZDA82042944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8f2ab605fc6fd6d97cf06aaafac007a499925e43ef7e9619755dd95073c07f. 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/QZFYZ2080048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee28d40f3911770861d4ddb2908b3400f2914ac32184052ed908a773754342c. 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/QZHN31918487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4949341e0b0e436177600a15818bb69ebd6a2d2e6a4a482d182696c08a4125. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFYX1973794.