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 0x749e57618db4d8eacd39f5c58058f0392c8b1b0c477670950ef2a7cf7548d0a9. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05b8b6c1-e7ca-40df-8995-459eda5934aa.json and https://artists.proofprofile.net/proofs/artist/05b8b6c1-e7ca-40df-8995-459eda5934aa.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 0x9b28cbcb6aae001a398c9c6f2c53070524515a8cba76404697c3f0414728e520. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DEF068304030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8756f2bbfc03ee728a135cc6fdc13c7a4f5097f4c3c051b8befe5f76de8ac765. 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/DEF068304040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2447b66efbba83afe721fe49bd8e6282844d5f16d488217c07dfe259a30614e2. 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/DEF068304050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadb31ece933b5c86312ba07ab80d2d97fdf3655726d53e2e47fa754664f65ed. 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/DEF068304060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59814fa79fdad00240ff7efe3fc1d1d14d9cd170a515b5056f077aeb50777352. 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/DEF068304070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1d60c1ff0313de9b11086ac3b73f1249351edd263f2b666b730ae9f1b93a2a. 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/DEF068304080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717c767c4155d5a177371354278b54705119109f8f7dd6473430dc2d9ae5ffef. 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/DEF068304090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce3d2c0023e5057c1bb0ec91457dc1484779942b8d0737c63414cc4acede6f1. 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/DEF068304100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3fe3677ef999c6bc1957d76519ddb86b6c04500b874eb5a2d6e0658c593cd1. 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/DEF068304110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2080c6bc02ef9eebed6d8c78345e2675d81184f78841bc09edf7dcb920ec7943. 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/DEF068304150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9b5dad3d6bab52f65b8ae47d1c6bf1f631fe5ec7fdda891f71ac01ffea0b88. 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/DEF068304160.
Prolog: Jellicle Katzen - DE 1983 / Musical "Cats"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b28cbcb6aae001a398c9c6f2c53070524515a8cba76404697c3f0414728e520. 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/DEF068304030.
Die alte Gumbie-Katze - DE 1983 / Musical "Cats"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8756f2bbfc03ee728a135cc6fdc13c7a4f5097f4c3c051b8befe5f76de8ac765. 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/DEF068304040.
Der Rum-Tum-Tugger - DE 1983 / Musical "Cats"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2447b66efbba83afe721fe49bd8e6282844d5f16d488217c07dfe259a30614e2. 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/DEF068304050.
Mungo Jerrie und Rumpel Teazer - DE 1983 / Musical "Cats"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadb31ece933b5c86312ba07ab80d2d97fdf3655726d53e2e47fa754664f65ed. 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/DEF068304060.
Alt-Deuteronimus - DE 1983 / Musical "Cats"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59814fa79fdad00240ff7efe3fc1d1d14d9cd170a515b5056f077aeb50777352. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/DEF068304070.
Jellicle Ball - DE 1983 / Musical "Cats"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1d60c1ff0313de9b11086ac3b73f1249351edd263f2b666b730ae9f1b93a2a. 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/DEF068304080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717c767c4155d5a177371354278b54705119109f8f7dd6473430dc2d9ae5ffef. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEF068304090.
Gus, der Theater Kater - DE 1983 / Musical "Cats"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce3d2c0023e5057c1bb0ec91457dc1484779942b8d0737c63414cc4acede6f1. 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/DEF068304100.
Skimble von der Eisenbahn - DE 1983 / Musical "Cats"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3fe3677ef999c6bc1957d76519ddb86b6c04500b874eb5a2d6e0658c593cd1. 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/DEF068304110.