Events Pre-1600 1124 – The city of Tyre falls to the Venetian Crusade after a siege of nineteen weeks. 1456 – A retrial verdict acquits Joan of Arc of heresy 25 years after her execution. 1520 – Spani
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 0x6b1baafbb236fd92a4dd31f9262cb2adc79e77cda3f332a0b66abcadf8436423. 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/b3b70151-834e-422b-a5e0-453b82654d42.json and https://artists.proofprofile.net/proofs/artist/b3b70151-834e-422b-a5e0-453b82654d42.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 0x592dfc37f4b731155d996933f9ed459713fa1ad2cde15c4034f3132982a2a830. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/UKXN22418403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21b8e4a620ba327e3180863c086fa1751f540e09d86c8daaa8423afb85a9b3c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFYX2478550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47075d114fa925ae935558bb9b64f3d2f38800693acc607c9151c2926ff0eccb. 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/GXBAV2342215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d543c8a37750291a3c8d71d38143e7e5bad930735d843737ced130367ec332. 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/QZTB92314342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413167c99651e64bc46b7fef5a8646013f363f6190eeb47e88cbba61b74022e4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWY2389986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b1e3e0b289513c8052dd07d5ca85385c9900ded799c14f616e29195081806d. 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/SGW502311536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e4a07945b7fa3584e2418f2c49134c5c52a84be15748d2f88ead1f516c0bb6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SGW502302150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c7095170e075a5de299e6a18195e68427ad110d38798376035982588f577d9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SGB502220172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f5ded263262dc6bf74c8f2b0414b143d3e97ff990f707e334c51b333925e13. 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/QMFMF2125599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0320bf3665b21e5a772cee3f6bd273e05493b0854bf4164eebdf294de992037f. 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/QMBZ92192412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3c71ee692af6fbae1b95ef2e7e7c4fdf4738c99196740bd4d11eded34bdd6d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZQAY2176431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10db3fa34f9f076ef8a00ffd5c5a1ffd46df31d8deb0149a5c25f574889b6907. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBLFP2107130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb8988c1148c9dc09bf413cc7c354029f22626a36db43d66ff5ad428a13367c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UKXN21919789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85073d137867daa59b69bf7aae50a38bb2590e82e72de2228479c92f188a4adc. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/GBKPL2006070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c78c66e190d5b5517d3916f29c44a2d15b2057c883a63475dccbfd9fb6d8bc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM6MZ2008690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb882d7257f1395fabd9e78efcc9e23cafeb2981bbff3c7ea14501e519602bb25. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKPL2090309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d6dc66a25a51590013f6499dbc18713308d852a4a77e0ccc6d1e662bb2bb0c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:41:52Z), 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/GBKPL2081880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb211777d8720616a6f12f8e16b1292ed0beaa9e3825621e2f9a69a86bb86ef. 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/GBKPL1811259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43033ebcff471ce4f24c4477b37b89f1ccbdaf77be04226bab870eb1371f3b1. 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/GBKPL1948766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5478196140a32a8df81405967cae482b8d785ecf5354e854a36f617dc909c021. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBKPL1788875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5087c87c810c28ad460a59acec72bf4fad244f797a80c898eec963a3eb6229e. 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/GBMA22452158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89a72b8a133c5ab1a73425a6711c44d13c76b71bac88147907a0cf625f805f8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ROROT2403980.