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 0x3f871d44945d6068e8cc1e9566e39198d69027bdc5955a8dab36332694bb085e. 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/fd4f4a88-4ef0-4b0f-bab1-54def179a596.json and https://artists.proofprofile.net/proofs/artist/fd4f4a88-4ef0-4b0f-bab1-54def179a596.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 0x6b2f21f10b002cfc073e67151fd8389e1f9936c63926fc0de16f05a2b8f7c8c4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/INS180359612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac9a61c07f067f9632dac1c3dc4684988b7e82d11da809a2aaf000b69a7e818. 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/INS180359614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74614179325104b8fde17b0986fdcc29eac1173e2704b0d1f29261db444da01d. 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/INS180359615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3c3d52f098a36a4fd1368d1a5da350961a41f5f37a65f5a11dd309c324be8f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/INS180359616.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e794c7f4dca2e6af01b86adf13a49a4d5a4ce65aa813c4529e624f90b664de2. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/INS180359068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c2a1d00e585d2b8d3bd3720a25e7b58d314d7edd89cc4aa5863b8865919f1d. 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/INS180359069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ffb05e841450d2198466666bb24d36e0a83869f20f6abc756b4e5cee2504e6. 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/INS180359070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff369bbd32c8ba831312d6ce7adeba79ba0d30c57570bb16855d51e77b6389e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INS180359071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fed858455be483be8272e2cfbf337399ea0c5fcecc46c332a8119fd37438211. 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/INS180359072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101fd1097fd8cfca6179f2576e238cfab436f73fd12de06a8f8d07a2dc942441. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/INS180359073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb82c61c87c2e8e0d3d2c6cf1fd098dc2606a2d0147030e3e5010fbc579aec7. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/INS180464352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a9b9edd343c2995f79652afecfd7e3fb6de95d47b26173cbac117a673b324b. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/INS180805151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174863623e8e819e23f5fcdeb7c55af7e148b4d996cee105791f10a98684b646. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/INS181801371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ef0d8f8b8aa3b648dee6e4e99fcd9a7be45a0864f76ef61e942a3d5655f3db. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/INS181801372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c38dab955cb260a5a07a9d84c7f21be1b7440b64fd608720663907523daaa9. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/INS181801373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74c63c2f020a763dbb132319286212f6766410879c6a7d48894963e7e4aea1f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/INS181801376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0190793527c4c71f318a0b7a6eed376cb2ee73e15db6738f9d837c5157f8c419. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/INS181400713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950dac4f16845645a8ae12eb6c76abf97b1cfcdd7b2ce94c44e5f4e34891f1f0. 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/INS181400717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e13c6dd3c504db31e77680b87cf176c42d26f7a0ac3d9a1968f1a793a015b7. 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/INS181400847.