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 0x75992f5e3dcd828885ddce992a88087329fc0853f106881e1816e569512dd3f8. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a586a4a-9b4f-4eae-bf6f-69c07c6b6d57.json and https://artists.proofprofile.net/proofs/artist/3a586a4a-9b4f-4eae-bf6f-69c07c6b6d57.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 0x06df2b8a083364de4a8e948f0b3d8b8770ac9e251283b5d191286da75737a30b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USCGJ2471998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc0cb35abcd50c604fc5dfb89a528ee3380b22c834d922d33e97a50646b87d7. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USCGJ2472005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd16386d27eaf88718685cc3a59a3940bdad5132619d2f0a8d66d1217cb4b29. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USDY42413209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba806351370e73c32daef3c3d1a2fa4315dd8dbe36491dad0ac0e284687e35e1. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USDY42413210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7730774c359f488c204806f3947dbbb5356317aac37ac14366a053980a0116fc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USDY42413211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c887bde283e7aca9c851ae9f1a207e979378fe3534aa4707a8fad1fdf1763bf. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USDY42413224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b2295fb316bb3367f8ed80044024b775829e185058f1db0fb979f15f720084. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USHM22417499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0217d2fd9e9d18be1ffad3b61bb1c6406fc43c54ae553c0ef858dc727e32e592. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USHM22417501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ddbdbb9a44576daf87a68df9592b5e412f6ee73a3562c509ed7e11697dd629. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/USHM22417506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010e22f0e5c7535823461195e958f879bd7ba66d95f50d703616f618f7a246e3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USL4Q2434580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8de88e511d7dd6e16593c173126953b2d383e5d984af10e23a0aa029382d9bb. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USL4Q2422201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4eb3dd020ea8c0e72b00b5042ac3198de56dc0e05cc900e5a16fd58ded4723. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USL4Q2422202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab63f600e51e338c1b132f684b035ea8b4a90410224d216c028c84d600ab35a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USL4Q2422204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730429d15ac7e207df9c0c496f40b8e992a538154b94a27658c2f1e0d36e127c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USL4Q2422205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3f18610016ff795e689049fb720f5669d9bfb19a809a8eb20c333dab1aeb14. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USL4Q2422211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca693068cf70eed68deead23671e598f3999c809682e806ea801b04cd4743bb. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USL4Q2422212.