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 0xfb0f10da5bcc56ed76e7c465c745a6dfdf08fea8f82fd9ab5afa7ef0c005c873. 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/96b92ea0-79a1-40de-86b3-16f5173cafc3.json and https://artists.proofprofile.net/proofs/artist/96b92ea0-79a1-40de-86b3-16f5173cafc3.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 0x233196d637c11e5beb05eea734e779d9ed156535662713cab0c563734b3a3bfa. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLA241700632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa365821f0dc1de2125f652d4f28e892d45c55a4baa959374da1f2741addffb6b. 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/NLA240300073.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c1041fea4462c39dbb26a3660d950189938eed2e8639dde6fd0901ed72a981. 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/NLA240300062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b765c95ecbf2b485729522915a115f7cb7c6aa81e3c22ab13409ea00d46bc4. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/NLA240000261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d11a37cbcb973333c605d5a7c5271f79e5fd648f77d65de9d153f033216af9. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/NLA240000225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ee9d03e0b629b2f6708eb739f01faff6cbd0ae6f7a038c92e76cffcfa0ccb3. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/NLA240300067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde48e7deb9571c1291b73f4d5ed2e5a299b575a093d2dd828873cad2dad949d. 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/NLA241700622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0701b7e06a57e00bb48e185182e6d0c978ab2b71f27464d892503f22f1483be0. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/NLA240000247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf24657acb4a2d3b1568d7f8b6e94b1c547bcd4ac251867ba6e6b4a3346bcb80. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/NLA241700695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c5be6ef4cd80cbc17dec0fb8f7890346497137a4ad52d6f7244a38990e65da. 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/NLA240605388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc581d0cf79114236fef98ff6ba8832159906a3c28474d2f97b5b23ec113d5fba. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NLA240000220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d11a37cbcb973333c605d5a7c5271f79e5fd648f77d65de9d153f033216af9. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/NLA240000225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbceeac0ebe362aabd3805e0ae6e96f1262f06ea1abb204324b664b14fb95d54. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/NLA240000228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b84f465f49408ec0514c29ae13e93388efe11a0fd1b59224728dd31928bde14. 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/NLA240000232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9e465f4c76ab9fe576ba4db012146be14e50b40eff433a8221250243d7cc95. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/NLA240000240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0701b7e06a57e00bb48e185182e6d0c978ab2b71f27464d892503f22f1483be0. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NLA240000247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ee9d03e0b629b2f6708eb739f01faff6cbd0ae6f7a038c92e76cffcfa0ccb3. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/NLA240300067.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9a6a8d490f01bda508fa27f644b4f882eac0fd58541c3f757c22180c09cdf7. 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/NLA240000252.