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 0xbdf88ab804f8e77ef9bd344f67cd70f1c4250a9e6c9037802337522225d5f243. 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/f0aa2692-f5d5-4577-b7c1-24e87f1e1d65.json and https://artists.proofprofile.net/proofs/artist/f0aa2692-f5d5-4577-b7c1-24e87f1e1d65.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 0x9230b0d6468735598666d9463fc7f03a33f8d45107842fdc7bc47b3789e766f7. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZTB72241822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e56480fd7b9c193ecfb53bb927dff5e2d74219678d12bc7decd1e3e359269e. 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/QZK6M2339028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1637e1edfde12d3c897e97c9d770845b278edeab9a440a59f47d7c1b5130924. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHN72416142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e5ca8c9a64fb9e7f8f5be58993fcb64556e69eab887010d37bcb80e4797144. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:50:57Z), 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/QZNWR2457616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ad15e39b943d0c05e3938d00915daa4b5b9ead279b5e980cf8916dcc6fcb56. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZNWY2426455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d9dc7c0a9a59eab5d89d04754c3ad69baf075e9270e68a5d5a0f055a2ffee4. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZHNB2593999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3450e956894f715b029593efd559453263c53f97c14c727fe004fb13e5010872. 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/QZK6J2510735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef056e4217c5f577e7c0228635b78ca97d869060f1b8747c1a1451869fe6ff59. 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/QZK6J2510736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03a35a744fa692d77d467b4e77029d7ae98c9a85fb85ee1076e11559cd309b1. 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/QZK6J2510737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8907437dfa654390936fc008560b65f6975e4496359f5041d5d9d1edd1644a5e. 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/QZK6J2510738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe76dbf71dea4bb3450a3c10f617a5fa8427a5656fdab1ca48a0020ed3eac14. 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/QZK6J2510740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeba9dab7c1711142f4919aefb8fbc8447943e92cd4ab96510cf4892a54e340e. 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/QZK6J2510741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8fa7e8e2d23b8b23e4c6d0c95800a288b373259723ef0fa6e822f48c2206c5. 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/QZK6J2510742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232d08907a45a47c4bbc2dbc55bfb404e27f74fdbe0cd707c0a8bf93dd950d2c. 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/QZK6J2510743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9bab193bcb971fab4e4b9ed0c3c84c7a78a14c630dcdb672ee4e8d4ef81e31. 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/QZK6J2510744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6066bf5d13c174473d5f824d08daf79fb74efbd6ffc2a5224c92bfc662bae275. 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/QZK6J2510745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f53360f0a49226b060cd8dfc36259301fc0f5fba22d1869add4c0a8db8eaf2. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZRP42575036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13f8b4a6e95aa62207acf2a35684470141f1543cdd2a519af8f66c5ef831c25. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ7N2554128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a88facf6c33583c3fe433dd769a368f22826ed5acc07ebef295510359ccadff. 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/QZFYZ2307277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565230b399ae7923863d75ae01ebcf0ce24a37bf5bbec6781d5d1d6618507063. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:59:27Z), 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/QZMEP2487222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7986f3dca0bbd257009846d1d0fc87c80436264272f8e3a19b7fd8b58e7d21. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTAT2347237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983ad0f3f61bc22e997d52a423c0d5adb2dd0bd2e58adf10f4f2cc991a1dfd1c. 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/QZES82344376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe383e3c182bb97e3df267bd6f657fc7e218e724b2795afbfa18dae18e5c36995. 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/UKEX32421050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b7416fe287a425515b1c8e5f0950d5713f9e182fbaa2a28f39698378fac8c8. 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/UKEX32459534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe914e7e661c8caaaeb5de8cce6c4afa153644a542ffa35863efd71cda6cd20ef. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTB22573232.