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 0x1db6fb7944e5403cb08fc39c924e2de7b4521f1271c19af2d942adea1c42db62. 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/27d854d0-043a-49a5-a40f-1e738aafb35e.json and https://artists.proofprofile.net/proofs/artist/27d854d0-043a-49a5-a40f-1e738aafb35e.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 0x3228b951f1f5427052a1e840a9718e4a4d459cd0569cf278238721950ed9a867. 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/QM42K1865326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2f1c6315e54d89713399a3933e75e86752671dd751d6be77a4f3c3b2d32e5c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CA5KR2049011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd543d437691a0c02c46840d8a8a985813fd37cb6cb41087a03c200cfdcd53851. 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/QZKDK2027564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7b1f48a8b20211ea0c25be13980d21db1b4c335c3983b1fefd6cfc5921a40d. 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/CA5KR2119223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f587e60ea8d76bf1232f05679f535b77c0fc88a3ea6bd020b14d609809ef1c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZKDK2233908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748062c61911bc6f717f48d811cb407d95e164ea0f92dce30454a79dae9c2b9d. 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/QM24S2200861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8692808abeff3040dcda9c0c446bcb74566a0cb8650af33f2c5df255d8f3c130. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CA5KR2245244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962cbf1dfb45be6f181cf932f87f8e551a8c32cbbe1f38fbd931a8d69d4cf288. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CA5KR2270126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa749e9464585dcee200169e5d077a660629d46aec808806d6b3860e8aad75186. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/CA5KR2307533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3f44397105335c37b731d3c9c9535204d12e181245b0c86f60878216fd0d77. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CA5KR2312260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fc7ed7792b55543df986ce4aa2e2b01581b79baaeccda03922ec00f9abfdef. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM8DG2347387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1702df768ec728701839e3df6cff54f3ae4eec3d7dd085cf2e176953fb4925. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZS632368111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856d7ca2b43b4ffe00d7db70b483c040f7bac47df423f2a6b76a078fa4871a30. 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/CA5KR0005566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3f44397105335c37b731d3c9c9535204d12e181245b0c86f60878216fd0d77. 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/CA5KR2312260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ea5c8fc4f7ab6fdac93a6497534f5f2ce59a669e45597049709de1a9e24dc1. 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/USA2P2332561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234a55af3bf1475e005384d9878d42eb4c1274b723164b1f028776fdffd52410. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZHCR2100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcf79794d92ad1a71f0dd06bdc59f7f54da2ebd6549cd817c4a97870d459ca8. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TCAEW2017957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d6eda251f520121709e87be113fa2df32a83d8386138d2f034f6904a740815. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/TCAEW2018025.