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 0xbfd5ed02d3c73a483a22beeb3eefffbfd1686b340df7e6405a1d194818a5e868. 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/e4d54248-b0f8-446e-8cb2-d253bd6ded2c.json and https://artists.proofprofile.net/proofs/artist/e4d54248-b0f8-446e-8cb2-d253bd6ded2c.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 0xfa9fbaafb62dc3596466716932b07bd218a20a426c1861cfee9868bf2997dd7c. 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/QZS7J2203235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a496649045408eb65c70457cfe2f8f8c9681c578d0239a7ddb44acce9600a43. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZHZ32278610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c2cda4929c39c7dff53b226b4846eb85734040b75eb47012459cbb1110b04e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZHZ32231588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a15c25d7eb84799173f51ed3bfb750cd3be921f5104adea7a76a866ba33596. 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/QZGLS2229153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb057b622468d50683a0d5a09ed93ebba119b84ef860b72caaf8ef9859fb259. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLM2242324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791ea9b03113158c790df653bf21716f7dc5e6aa73ed2cad0684a8a7b1485ee6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US7VG2237079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b7ab537cdfb88febc2c8928c21a0cb70c3550dcda20b87aabdd649fb29ad7c. 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/QZPYN2113316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc557dc3585176cf6896d7571604c7d661e49befbc0f8ce6d23dbed20d1216e81. 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/QZPYN2105406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99a325f27fe1206dc10cfacc87496ae88bc4b412ce6c6521289d3634aec599d. 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/QZPYN2104994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419df135b47c644cb3b9bf5c19cc9041f81ba7f31647b8b81be44f553b327588. 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/QZPYN2100878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3450c1811b2d38f8e3554d079124f1bd3bdc265485df428a5013bc01ed217c1. 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/QZNJY2012642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb4ee0f042c0d63c920db82a7c6e8ab21423c46d9ee2d28ed8470e5eef5d927. 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/JMA272014264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1fddf0bc3aaf5e45c4d77c90c9bdccedd8a21ece32f3495f1a2021001987e1. 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/JMA272012558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5ecb1559300bb4bb2d6e72c48f86d4da003c570e43e3c695b450774428ffb8. 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/JMA272011652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8e7e24abca5e56edec4b97d25dbfe8d30ff889a5dd54aef4027d1d77c284ec. 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/USUYG1335528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60317473d78e6e17d0263ac0887c23cd481a5f684de4ab476c0f2e7053fc792. 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/JMA272010927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd555d677cbf3c43058dce54c933f6a39cfdb356123e71889650851e08464bc44. 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/JMA272010419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed62a101476a9f9d0250a594f1dfdcf8f8642fede9725e6cffb7315fd6cd0ba8. 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/JMA272009486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6d2505e81c13f4b38d4c9aa0d8abcb31eeceb93fd3ddd3826a45241c7d2c80. 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/JMA272008842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce5516bad925e8e4c825a45288a06228becb47d88b4b487c839f39ac2acc21d. 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/USUYG1324756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa30165cd91a7d30f0680eea2fbda79d1524093671d19a985803812c7628c5be. 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/JMA272008477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117539a79dc8d014d325848c254b160e4e21278d52aa7b81f8ab7adc8abfcfcd. 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/USUYG1323096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744be3ce21988ffa5baa2ee743e601ad6956f5d5a078597538caa9c5af1b91cd. 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/JMA272006171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3bed4620264aebd83c59db8e39bb43ddc41e3bdb9f84b88257458707476205d. 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/JMA272004050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ebc8e7dcf533f650963e22713381aac14ca1d942a7c1aaa3d87e4d180caad5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/JMA272004051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea871f5ee48bedf8f54663cd905769a2173a14115fa3daf69c8f1f39ccb6fc7d. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/JMA271902702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cff743d571f8aeebd273396ec0d2c44026e0434bdf7289383a3f10f25cebce. 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/GBWUL2116977.