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 0x57e0d5616378872f62f5b1f957031a835ceb9f6b530822e835516b6e044055ef. 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/6e565385-ec50-43fb-bc77-d00f934fa445.json and https://artists.proofprofile.net/proofs/artist/6e565385-ec50-43fb-bc77-d00f934fa445.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 0xd622b93935bcb6bf152e5ae26e9deccb3c01c94dfa5d68c26d45812fe1e2364b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ES47E2003458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfdbfc67750eb664c6913ef5b06f0f0e743fe8a4de4eff528bcf715e3062f77. 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/ES47E2004390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f96408b10c365f51e8947be847fdf2c1b89e454541b55e771ded845c9eecd2. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZTAS2150862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f96408b10c365f51e8947be847fdf2c1b89e454541b55e771ded845c9eecd2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTAS2150862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e1e1b07a7257dcaee7699b26ff68921082305a55d90311ad26b0b4a6f68df4. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZHNB2287681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e1e1b07a7257dcaee7699b26ff68921082305a55d90311ad26b0b4a6f68df4. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZHNB2287681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f81c4efca8c23846a2e4ed6ed57b4ab41297a45402b5ddfbebaed0f280456f. 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/QZTB42264802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f81c4efca8c23846a2e4ed6ed57b4ab41297a45402b5ddfbebaed0f280456f. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZTB42264802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800145f79c3f673c6ffea87fa3c638f54879b5e27a60a926158787bd775b4a05. 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/QZHN62331614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800145f79c3f673c6ffea87fa3c638f54879b5e27a60a926158787bd775b4a05. 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/QZHN62331614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70561cb33470f0a962402ef1beb3520a5d1ca35943037f92dd9abdc14315d8d9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZRP52359216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70561cb33470f0a962402ef1beb3520a5d1ca35943037f92dd9abdc14315d8d9. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZRP52359216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0953b7d8994f17e88bd971bb7de88d6be7e60af7d6aaf58c2ca1fab46edd105. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/UKXN22341593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0953b7d8994f17e88bd971bb7de88d6be7e60af7d6aaf58c2ca1fab46edd105. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/UKXN22341593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68f59fe76e1db8e87b294784c2d7294b91c74fef95bdd123f3c0199b8342b08. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T13:55:29Z), 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/QZNWX2436008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f3eab04f2cfcc5944292b4e8a91c848899950a41f440f1c11689265a83e743. 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/UKXN22481907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68f59fe76e1db8e87b294784c2d7294b91c74fef95bdd123f3c0199b8342b08. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNWX2436008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8e2fc33bbf8a96ddb74eab00e735c57025e61dea11a9bcf0f51e0e00bd1bd7. 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/QZTBA2450448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6cd637bb3b0a2fd6ba6d3828b38fc7a9b8869abac7a613f73859ca76411778. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7Q2461642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9578f640c79889014f29f33fd5690ca948bee8d1e2870667da16701d565acf5d. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZMEM2514781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4a18f9bd915bbefafdeda2baec1d59948925d8c33f90af418aebbdf0482d4b. 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/GBLFP2563606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774cad02ed08030dbd47acf305c6bc35a7252d3e876802d29df88260f6bd055c. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:05:24Z), 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/GX3Q92573244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58241f3accb4e440177f735183ef0dc70e84d2fd1d21d82850c889abd34ddf3d. 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/QZWDW2399296.