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 0x66d83b151dd39ec433d20877d9c21dd9ecdfac4c2fb020edfa61f363f5e01520. 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/c1219eb3-34cb-401e-85ac-e7da27451a4a.json and https://artists.proofprofile.net/proofs/artist/c1219eb3-34cb-401e-85ac-e7da27451a4a.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 0x78f0eb8cf4de7091d53692119e3b4f5d502c26d1260aba886c458db60442a8a8. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CAQOI2200123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df37d9f6ea5a5fb43517003936ee3470d82d785851a11c9e6053166ce8ca6f9. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T10:44:21Z), 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/QZMHL2264167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31c7e8355f45e7982fb6314e3da7a8514dbbf6bf6ccaa226caed75111209652. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:03:22Z), 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/CAQOI2200175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebb6d35f4b8b2e7bdc4f530b7bd6b075071aead7000941ba73411e22c47b7a1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CAQOI2301013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea705c3b8240b4011e01b398fedade3a17b61ffbf9c0b7520053c4aa95b6442. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBRKQ2396589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02250a707a9a9275ea61ed6fae7ba72df1a63e259c6ca6d31dd6d9caef13cbb3. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/CA5KR2358501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb762e05484142478a4f93e18994d99400991d2485900a3939c9aacd8a7bde292. Chain 2 (Bitcoin): anchored in block 956405 (2026-07-02T22:22:35Z), 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/UKZGC2303912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4cf93d5c7a88c46cc578270fffbb28274a7a26c3dc25c8bd49fc21b5209674. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/GBKQU2364707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0deb3a42a597f8f20da991fb5b8d1c88ecab0f6edb4c833a2bff0116638903. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/UKZGC2305246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19236f3b65ba7051b0d478bdb0d932ef1e69ef9b9c8f4accd9103c305cd9814b. 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/GBKQU2378484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99e93cf700c7a5354377db0cc50f4fd869d90081aaa73094ace6979753a5ec6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QMANG2212651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3579059fdcd200d258eaf2db4bb0a6050d31b759dd6f83e3be12810cbe221b8. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DK2DY2300428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08628a98339525ad619ae9087fe5a998e9b811bb8c9925c8691412318d69329. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4TW2451822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b47696edb1063203bc42a6ba3289b164d9a59b94ea91f70d6ebb8e81a6565d6. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QMFME2412740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f77f857d7348a58594b38c44d8ae10021796fddc7f2091b1a11ca7073c915c5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US3DF2400682.