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 0x7b10acdf5da888f05826673e22dc953418286e9b4b9942e69137815e02bff96c. 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/5c66d81a-1f0c-453b-86c6-20c8bcec5a62.json and https://artists.proofprofile.net/proofs/artist/5c66d81a-1f0c-453b-86c6-20c8bcec5a62.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 0xa33b90ebf3b927a3277f60936df1df3b6443344d3486f1771d9338cf40910faf. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/US7VG1811047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e65140f7b07c2099a8444b3d0b7e512ea2d5b8bc73bf65871df40530bca751d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USA2P2043833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e613b3482553d3a177605c4a917a1e21de31f3c1a6e29648e52b18350a1e4c. 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/USA2P2043834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4c41ecd8e9aa4d579864817e06839296ea352c5971ea8df28a7cecc8547e40. 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/US23A1540987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f60fb407863aaeb073c63767ff0d1b0e234b6354bcaaa88997b2eec273bb2e. 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/QZN882264683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fa188a907453dc5af1be342e9c83861a3bb2eb535d777a08c178fbdaa9c05f. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZN882346379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c6dc99a94782a1a2aa8ec3065f9bfe584fbd3cc0adf5da10fbe190092a8a65. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZYFZ2315212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0779451d4678ebfac853018331e3aad7db025bf997cc080e112ec90c6b13f697. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZYFZ2313143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abb00a9b4969c5a1ea7afc4b1d61bc544705567ed28625852a0b32f33f312b7. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ662302206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a74936b497a9f067420f225c53adff21ed25beceab48f6e4c4fd653a078e2f9. 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/QZWDW2460878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ad781230af4bc36ea944e5049ea26ef1fdb14ccc9a4565ca5e9ec24dc48cc0. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZN882501899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1885bc92f1baae96c1d96b9ba4e32daca5f8f4a061e90b22f84fb473b3a804b2. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZN882526344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209dac21b98062fd3d78381795653831c14de4001f01b724b5398e184b8a3d9a. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZN882563182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdc615e236bf227d622934dc9bdd6b73cdfef90f7c067408be6ea4328f45574. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZWDW2502278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbd1377649fa2286b09e25595f1f3c036aa0a2afa8d2b6d90cf06a5ca4945b9. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZYEN2307890.