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 0xee3dccd017a5926c98a15b36411c264cc8e435c41e226e7e7f23ba71c8924da1. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/babbdc84-843f-4806-8dc5-e6d1e2589f6d.json and https://artists.proofprofile.net/proofs/artist/babbdc84-843f-4806-8dc5-e6d1e2589f6d.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 0xca29bef362a295d1df81cdbb1b7c4cca16a74992e1e602698ab711346281b3e5. 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/GBKQU2497488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9b013e8e0e82876b3957a65aaa73dbb360ad28e41d0c3f8ef8fc7326d36e86. 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/GBKQU2496950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe06484fe439c5b30908b9bd02a742c6fd592f15f50def5e686521c15913eccc. 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/GBKQU2497098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3758908fefeeaeea8a1fd2f41d7b421e149f3d4f39301c70031a369a8e4ad49. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBKQU2503713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c6482ffb060e3ac1332adc272c24f66cbb324b54a5de2c494b62806edecd38. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBKQU2497100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc29b6d2b5d5eecdc98c70aa0b9d773f11b4ac1b523c4f34751dfc1f1df93cd. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBKQU2497104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ae30f658be0518f3fb4dc54c64a9d096983c34f4cb468c46fa1f177e2fa980. 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/GBKQU2497113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315704b106c2a39dfa7fffb44e83039c31cdaa3f5f9b43afeb44e7438f159dd8. 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/GBKQU2497994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bade6a1211b20c33ac40cab6aae38c6d76ea374bdef60f0c62d866526a55a51. 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/GBKQU2503714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315704b106c2a39dfa7fffb44e83039c31cdaa3f5f9b43afeb44e7438f159dd8. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBKQU2497994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc29b6d2b5d5eecdc98c70aa0b9d773f11b4ac1b523c4f34751dfc1f1df93cd. 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/GBKQU2497104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c6482ffb060e3ac1332adc272c24f66cbb324b54a5de2c494b62806edecd38. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/GBKQU2497100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe06484fe439c5b30908b9bd02a742c6fd592f15f50def5e686521c15913eccc. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/GBKQU2497098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9b013e8e0e82876b3957a65aaa73dbb360ad28e41d0c3f8ef8fc7326d36e86. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GBKQU2496950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca29bef362a295d1df81cdbb1b7c4cca16a74992e1e602698ab711346281b3e5. 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/GBKQU2497488.