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 0xf7228ca7d33b65ed17b09884ecca52669829ece946f656efdae0a3bccc88c749. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4878c162-d77c-444d-9072-7b713500abab.json and https://artists.proofprofile.net/proofs/artist/4878c162-d77c-444d-9072-7b713500abab.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 0x9dea3cad04c01c17d7e8d50e3ab056a23373b854e2126eb4a23191a4665a1ab4. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZES72006646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ce8cd6acca070f8957e127353be66bd1db35a520a0528bd845caadc29c262a. 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/QMGR32111071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa19c671980c773a968e7c793f4811a958a6f2ae398fb9498e9d5d9277cd6d22. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZFZ22141696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d2ecf90d4312fc4692c595f1c46de03265bda3774c4bc59fdcb355a7560530. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZK6H2175692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a766b7e37f18572d644d43e7adfc3bb609c195f2874ed888f5d49d3ba8cfd0a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFZ62252496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1744efbb26307d9e73342e4dabcf91e2b2456930675f00e5abc697678ba8d3c8. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZFZ62252498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bc83487a5fbc218b082bbdd1219aeda64ccb972b3dcc626e8204e1a10a625a. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZNWX2234876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677468db5df30214781434a442c9194b9ea9b2064d6f13e5e7a8022f86f39316. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZTAX2231469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4553e495266c09623018b13873cbb89be3185d00933fccc31dc566d9c74c20. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZHNC2310977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2859fffae5d6c420065c127218a12a6684e71d7eacba706901921ddfb011a521. 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/QZHN62367187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031af03bf279a14d74da756321e91f196cf6041249e9f129b717c3c3e61633cd. 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/QZNWX2300969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07119c4f86d4bef96b31f31d47237243df674435f14702b67001e30432eaad0f. 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/QZNWX2300970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff4c3d35d0a8f3b98df66a572b1dd60df10464f79b989f9b9d33d24ed2966e6. 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/QZNWX2300972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093ad504dd306036e830947b385602ca5db4addfaa8da7e2c08a890ae2a53ff5. 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/QZTB82364781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe822896daeb6cc043ac8a06256f8e8abdedfddc6286e36420debc90ebbb1ae1d. 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/QZFYY2490154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51afd1a9c78e8ed5006f28396f64994588e8afe34a9c6d69e64fca3a396b8c5. 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/QZES72493732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf6572417392f36b0697c63460a968bded0db8617feb192ee9dbdd8e22b980f. 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/QZWFR2419837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd0870367976f7ded95a0a1f6044648fb04626c2603675d30f261ad4a2a7264. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZDA72562592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469fa994cb015a4c42e6d4ca716d3a36be93671880bf2540717ccf49077b0652. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTB62524002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4814b88f14fa4f93c1268e3f7cd4025e31251f3a731d59b96d78ef0581ea5f. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZTB62524004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42cddda9900e6f11418d4b6923c3903b3f128195008ab2684654841d633dbed. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZNWR2252172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14780148aeefef137c22f9498681f0dfcf9966538c9e1f2dbca01ec1fdb1c51a. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QZK6J2058834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bec74ea30295916541d7b97b4e6c3583c5b11a87b8b30d078bdc1b3e615e16. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFYX2478330.