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 0x3bfa60888a8b739046954163e026002b4a5bd6362bb6d872a85946b2c1acc681. 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/f3620c74-865e-4529-a929-b5dcf04c8d91.json and https://artists.proofprofile.net/proofs/artist/f3620c74-865e-4529-a929-b5dcf04c8d91.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 0x858d57a5db9b79a21e7a51503fdc2b319573b05b039150d47d873c5daa60ae95. 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/QZNWT2314357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170017494f5cbcdb5447eba5df579f209ea63276db8b23027cc65bb3828d5e12. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZZ7W2462285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522a1b5ebb45e53f5c16368012d290daf0d80993f45df3fba48a1008cfc95455. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZHNB2486650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba813b5de13c2eaac2f0474e148fe5774ded2689f4c41932568617f78dc04a2. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZES52314234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5aa42e8f34b61597c0af5f33c18e31239a9fb3f44bb38805933c51494999cf. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZNWQ2416134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d962b27a4037a939ca3ae65b739e34125c0c39e30e9dab8a4e733d8f7bb1e22. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZNWQ2416135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd762da2a228d9a1eba51a3dc3cd7234c4f8ada28c302a305af74f88c16c896ec. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZTAU2479097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82e56480407b86dc191c47a71508dc2ff3029a264d39ef98b29eed8e92d24e1. 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/QZZ772454211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1e13f1fb87bcb30dddc279800449f2bfdaae09589e61fd347011b04698ad9f. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZZ772454212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d8832dc3e8815da2e2244a18d4b2500b9e4bbb6a979a89a0931c283dd2d76e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFP2468653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc093c5f136d73f1fe57ef7a941aa2eaa22bd6788f02abf000e5cc1745d0c637. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZZ772454213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e33361c9c55061d9b0525bb9683809d7f512dca4a373c1bb1f00edad2cfbaf. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZZ772454214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf88426cf6e9352d293b75066c17cf969f1b167e6e3a8af2005271b7d86a2cfb. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZWFR2479443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8cba7f8529f1c19001e2c5b0bf527c5359a1124f47abfc38495a5e48830180. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QT3F32447907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6b82df3093f2196f9698e405ecbc328a1b8099e9c6ca9973716ddaf2e18e8d. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZES82504657.