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 0xf46dd12e0df3468923f2029be3f5ee608b7b431a073dd923792d65132ec0c563. 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/2bb36396-0d85-4faf-bf5f-ce906fd694d8.json and https://artists.proofprofile.net/proofs/artist/2bb36396-0d85-4faf-bf5f-ce906fd694d8.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 0x40f749de5b6b313fa75bc0898c55f61c4538d777387aafd83b6edb16e6907862. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QM42K1964989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb129d5f87a428ab6444fae384386010da444cc322f255e3343d9adc5a5b26cad. 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/QZMHN2067780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb504d581329093c7a051ba668c875dffac9b07e85ef16326e704da692d755cc7. 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/QM42K2166554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4815fd3afb28d7dd4febb4c00c742f8a8aded282eab53105633ff9cc54263593. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZKDK2257132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2635ff8f5438288ca0ac4ff9ef34e84f4e552ca6d2f0baab15a50fc8c586dbd. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZKDK2247289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3d117bc19a6f6628735a665b6d165b9ab8ce5a67486fc62812ffeba7021fdd. 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/QM42K2285731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54643a79455e72fbb0c92ad7c6cf48db135ea5de34eed63b97f35f3eb51d08eb. 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/QZS672274750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262e7baa1e88fdcefa8b12bf3e52027d44f71b25a78ef64175b21f29fbd1ebd0. 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/QZMHN2269847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf913d876bab2b2fa76162fa3cad8e5731bc730126f3f59fd5430ec15d01f5fe. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZS672228852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767f1cafd4b878473fd23c7247cccfa5adedc428d743972f41adc3994d869d26. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZMHN2219071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2dce915d9e289448878d8dd0fe8fb297050225a69c889915c454a58d45ab3a1. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZMHM2342040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7d79e12ec839994bbfc8dca942f2bb9df84ba169c923d0b5de5213b5408a42. 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/QM42K2366814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f2508a9de03388e684607c5ce59a892f59db907797e388a5a61942fd6e1ed9. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZMHM2324702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cad162724f6150c29831f14be998cb843d1b3ddde074efe1e19fdb0cdfcd604. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QM42K2305464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b22d55075faf94d14f3b5501c2cb2eb591e38ddc8ebbe86267a3f6dac820af. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCAHN2363617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07b68a1f3c9ce87d5cb60c8f150ca073e95f78d9ea2c0e0808986fa2e338439. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/TCAHN2363628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27161f8a419d14e1427b2e8859fe7b8d4ae3745186d154a87df5c399d5da813. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCAHW2403050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d12805e10f55cf828f580dbb7bf4e619885577d1a67371364b585bd0813b6b3. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAIT2448055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709effc66331ddf483c4694184170f3e7412d8137061fd9043eff2bb2e1f6333. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAJQ2520511.