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 0xa6a858fab9cb674f19fb965f62d4c9b31790dc785851060c8d82cdfa44e9973f. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3058df0c-ef40-4e5e-a5c8-e938f2d432a1.json and https://artists.proofprofile.net/proofs/artist/3058df0c-ef40-4e5e-a5c8-e938f2d432a1.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 0x579e4dcfd767824a1de6400b2f27d00d4ddafbc0660d396ba18bf9c6dcd5f018. 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/QZS652350586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277984ab3d02c701232cac206df76af57600eb267243a694de995e98e7e2d2b3. 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/QZMHK2251332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b43df25d18dbecb670e63f9b116d22c2b48c3dc99aaa722a4e4306dd7f92ed8. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZS662266428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1e5736c2107ca4f765fa4576fefc43d3a9a846a2c051e06f495538bdfb59af. 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/QZS672264937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a63098fc0e74b1c0b1fa03bff25832bd9510655c9be3d8bd93160e714ed3fef. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QM42K2282139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5a495ead6d00214ee51d6f37456994952591b0b780d7842c550920f5c12c22. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZS632173169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5e5da549eaab0724a07993b23ae5dece5b0f76c87470b54abb7deccb1b6988. 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/RUA1D2211766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f58d011fce35b8fcb0a21a63095c49ae817bf02de64aee3291434859584f04. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/RUA1D2211767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3232ba712cbf5e41a1b26e092192b4fd8af8bde39306b6491afc0cfcbee0ff5a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/RUA1D2202346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978638a0266295f143f63d4bad1dbb32b406e297bfb6487fb897dd0760313a50. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/RUA1D2211770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a59e15898935c89713a7125d69def020013d7174d414cb0276850755790598. 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/QZMEP2466092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1520cd53de3d834202ec011a150d1633e77ef98585c4cce3020c1d5ed934b4c7. 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/QZMEP2466098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6033fd349b09510f93edf442cf87e381c8e104e5e8a931ac37f9eb6691f1d7. 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/QZS662265061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f31ee641c0f2eae87defc0e783ff6c0033668be887f7c0a4b522e1fab9e8fdd. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZS662221505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c97905a1e4e0d317a7ca9bff86486e4b43dd958013320bc5a940aef4318015. 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/QZFYZ2203077.