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 0xbe80df4a2e1d34dcc965eb7fc3f203c9e7853c07df2c10247b2af900814731bf. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/488b8f76-5289-42de-aa4b-b87d67f76ef1.json and https://artists.proofprofile.net/proofs/artist/488b8f76-5289-42de-aa4b-b87d67f76ef1.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 0xcedb5d7ebb88ee388d1f8a4ef4c5cfb33bc4d18ca6b63978decb44a570ef4002. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ES75E2400740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48239026d7492c427d757901029274b548cc2942f2c797c4fc56791c8b9f979a. 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/ES75E2400741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22780c6084e4a0618855e629d9f3cb26951ad23999879837857808a8f5d1820. 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/ES75E2400742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab1cc0f7e074d1771450e5bd172d88944a88afb5381e257ed3816dd3353831e. 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/ES75E2400743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf325891c52ef2b1546cbdcb655d6ca2db0e8062015277d2760451173269f58a4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES75E2400744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb51dd66ea73bf44f77284f0be2898a327abfe188b55c7a970a2ca7388a2135. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USHM82375544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a3c60889a06391a0248eb767a561d8a9e079e85f4b22013e7c8e130f87fbd2. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES75E2400745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4e657933f5a3949608a84b335b6fbe561f637b58952705d610cc09768ad42d. 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/ES75E2400746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc26e65ee292b42dc4c4015fbe05db44197397d116618c91558c7748afddfde. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ES75E2406565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea9665fb0d5fa32d03e3e0ba38563daab142db895ccbb6bacaefccb45afd686. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ES75E2405218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403576e70db4294b1296774f4a2a3d9542b5d4fdc6a76b9176b43bc26c377738. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ES75E2500504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbdbcd53b08c43d17a3f18285cc5ab2b634456e0ede6f287efabc23fa908b8a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES75E2500505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441a93c40aebc61c7219d5088a0f6404ea73b7bcc4e0fe6620fe1ce8f71d2255. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/ES75E2500506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2b07db28acccc94b55c22eb79ba78d45f4cd2d8554f503d08b0911e01c348a. 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/ES75E2500507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284afa3da3c23100f97d7b6c168456aa122a6dc7cf82a3506e05a0468fe7394f. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ESA092410438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bc92be80c0e320ed25f23220621a938b28f012db7a83f70f9304d5095915b8. 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/ES75E2500508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf083814fd2228fd23eb186d129be5474a598084feba199355074f5c1f2d9b1ff. 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/ES75E2500509.