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 0x926f27ba9c0e6879fa1aa7d3cab774aed7731228866ffc0f9c6f7d02ab32dea6. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2c25b9c-e31b-4459-a420-b7610dfb4d6d.json and https://artists.proofprofile.net/proofs/artist/c2c25b9c-e31b-4459-a420-b7610dfb4d6d.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 0xf67bd3c0fe9829422c89a69654f37a694ecbf0ade9421b22d04c2d9117d3e6ed. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/TCAIR2448983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a96d9f42acbeff8c50f7010921de58c8f0cd26e3d140febb09a80c3f27bca9. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCAIR2448991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6552b61039565802b3bd88fa3d39dc6fa9117252d30e6989763e008dbf00823. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/TCAIS2449003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bea89d52f1e50dd8a29b1d74caf64af835a4ab3b0d77ecdb93a4001d5a4175. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAIR2449018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0035a95d945d1375b6364e3a1af7f459307ccc3e0339a306cbdcee5ba1d1efc0. 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/TCAHO2372692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5d501546e3753f6dc48caade3d58404c447413f4e4bfe927f0cb35565fdab3. 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/TCAHO2372735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd110c2525f8a71aaa138ed3cf1aff3376a3c71c2c3af8e76a06a4af6ab578fb9. 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/TCAGF2242052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fbe30b8bf16aa2f4b18fa87cb404a5dad77158e1be674d5b40801aa031d238. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCAGF2242076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74aac38da430acc123e32977b8d35d5c101e28710f5e2c68833df2dc87cacfda. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/TCAGH2203256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe502ace63fb1a5278bf0c7244da34f3be8dd14d2440aa2f256911fc324577ec0. 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/TCAGH2203260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ceb47ec0f0ef3b9e8ab4708d44a198afd087db8d6444a875dc224028edf1478. 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/TCADR1819999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bbaf45527afad01202bc4c44837d8091cc1986d11acda5fe1998262ff35501. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TCADR1820002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341f1b1cef67c93e03c2a10567151fe528d5427474b03a43e7567a8c64048667. 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/TCADR1820004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3f0697d2f621285b6329778ae655fa8f4045b60ddcf2c0dd842fbf148e28c2. 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/TCACE1591153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd00921596ab6b29443742f5fc6005e73f2c145ca0769c03297ecd4ca673042. 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/TCACE1591154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15216fe25e6e6f9cbe4ec89e294f51dedb1bbd848e1db9588f229d844e5d173. 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/TCACE1591155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9ec5e1b0f90d8b2b11e6e054e34b2b354e62381f2a9046916a38e9d6756d10. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TCACE1591156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc51773945965a2360f61be7d862e41f2b779417c04c36852eac0eb103d9768. 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/TCACE1591157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8857ea6b6d3dac1450919a369c83c2c64ab29123d2bcb758b57e557ee4534644. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TCACE1591159.