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 0x7e3d9a3808ce8bc154063cc3385e62486103a91223ce4d1ca9306bdf360d897a. 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/cf3bb03d-3be7-44d0-9fb0-2a750c53fa51.json and https://artists.proofprofile.net/proofs/artist/cf3bb03d-3be7-44d0-9fb0-2a750c53fa51.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 0x140478062d2a5db7c316bee24786e4713dcef35604ae452bd6e462400ac5d21d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHN52330938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74feb4c2bf0d57f8823fd2f83fbfdf9538ec16631f0f4bbcb788566762fbaf3. 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/QZHN52323591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5df97646c434408564621aeec4d18921f8de4222e57ca6d43773c56cb79f4e1. 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/QZPLS2386851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7cd2a03b14525d8b0cc1e9ade6213de4ee389de63897fe05b3337e2cedfcc6. 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/QZDA52395446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46771d70530895305101816a84f8805d774314948585bab7c4e54cb817956657. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZHN82343500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc828151eefbba0c2becaaf30f49e54ce1c14251ec3e4c98b562d84cb8b84e3. 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/QZHN82340450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9147397bc19ff370252337a592c908868c9fb6cbd229a7e942446903119701a6. 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/QZDA62324665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391741ea1fa0cae92081b321857b22b08ca549d107fac091eca6fe5e3563d0a6. 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/QZDA52396158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8027a110d3317880fc516a513bc5810ce5d77c23695818adc15e9662b86911d0. 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/QZDA52396155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e13a3aa44b725e4442a8578661fd1b459c909391aab276b20d246f3c2856ff8. 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/QZFYZ2254137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787474e07622eef6a6c93b5fc3ebafd2e416110a3fc288558658f1d0dbb0c0af. 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/QZPLS2181386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fceb856f4247d7fb09a048ad1fe047401e6ce9e61c822135ef7e20d986f9c5. 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/QZRP42361173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c81a1fecc2440c70074aca8f16b58bbfafe66afbf240c442a10f37fe9a984ea. 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/QZNWX2171112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a358c31dec545e23572956240ddc3827ba9c0bca1e554a5eae8aac5976559e5. 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/QZNWX2183546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2de921da5177f3a9e8c1bade51877aea6a3d5bce3a1e77b600f9c37530b9ff. 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/QZNWX2182128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad170e1246617488721538655a08b7d4089a18b1838eb1dc89bf28044369dc85. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNWX2170830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358845fcbead1fa2a688b346c4715728b7ae1afc6ed58c36620ac2f1cf701313. 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/QZK6K2157143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ffc8c10d8bcdbaff16e1196911a61ce966a9f4b0db3f1c654a07f57f19657ae. 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/QZK6L2166115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de5570c948f48ab793b9e89a17df985482593fc97be17f6b91cfe74607c6ac9. 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/QZK6M2146316.