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 0x12be1a24bc67f8ec06041eb3d89b4234c99b48cfd5ec61eea62167090276364b. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de61b465-f9d4-4501-af23-727e628368bc.json and https://artists.proofprofile.net/proofs/artist/de61b465-f9d4-4501-af23-727e628368bc.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 0x647dd0666c9bb9873ede59d4fe667e6e1403a7c5e06295957b9e1bf4e0e98cc2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEQG42007622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c247f57881ee5b17fa95932ba5e33353268c21d3175059d205bab1f89c873af. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEQG42007633.
Ich furchte keinen tod auf erde: Recitative: Wer welt und eitelkeit will lieben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f97aef91ecb31f8f28d8d76e2a376b3d409256bf30dd376f96e5305b6436068. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEB901200113.
Songs by Henry Lawes : How the Rose First Grew Red
The First Booke of Songes: No. 9, Go crystall teares
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76e714ba267a3ad35b3a36476875b09d52e43e0d09fe4ec051e1ad0e9b8b3d5. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/FRZ140726010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97114bf662d3fc6f88d5f6e9801dd24a02fa234abf0a26eff81e1aa333a6b274. 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/FRZ140726020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8addc106a6e0b5a78435e576270737581dd1fde3d7947d298743e402484cd47d. 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/FRZ140726030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d04c2b3f86a2e8e25fe9e012bb3316e38516b5256643c1a663ed20d96e2fa89. 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/FRZ140726040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f4192e40644d9bb7732e1bc5ed49536a1e73ca1fd7d77834aac4fe0271aa24. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRZ140726050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce4e45cff21e6e6bbc3495716b1cfcb53dc66b87100fe0d4724febcfbc8de13. 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/FRZ140726060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5dc3a891749ca6d9f3e8ba570392498b5518716323659a371083392133e3c5. 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/FRZ140726070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd428603fbb732b7d2202d24635ee453369781975281a2a3d5e64561007f0d79b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FRZ140726080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35106a17e9ac9ff69ce2c9e00a7bfb1b2e8f25fbccbb1ff09a82f31c7aef7e0c. 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/FRZ140726090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db8e755966f529871366c6b5ab64617af7f2be78a1e5045a2855fa0dc31cf16. 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/FRZ140726100.
Venus' Birds: Venus' birds whose mournful tunes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca008c7cabc36057b06141abb6ddff39151cce206a30ae5445aa93e165bbabac. 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/FRZ140726110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9795ccbbeb508e9bea1d4dda151d94c43203e6b1951f8f5d5d7a87f93e04ee13. 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/FRZ140726120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09108cb90822721116bea687ee71fd9a802cc2e8db958ad5553b9a6840ca8ee7. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/FRZ140726130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a79794bb59aea445194373d208968615e9063a9b25f1357cc6968f0d41651b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FRZ140726140.
The collected Lute Music of John Dowland: A Fancy, P 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de920d06cee7202e4916934414c77d520069c339bcca908b4fc276990ff73b5. 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/FRZ140726150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48fe073d23a321ec7059fe817ce9f4ed83291a951630688f4c4cca5f70b6763. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/FRZ140726160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d51960fd2c2b328873e70b90cb13ff9b4286cb6948193380bb8fd48a68472e8. 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/FRZ140726170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbf00055250cc7a96b44159ab8c1431cd9814d54182485fcc30db777efdfcfe. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/FRZ140726180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43873d82fa9c36f997f5280cecd514f71602c919bfcd7cd8a292b5b871629d62. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRZ140726190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1240d265094953bbbe221b7ece29faf4e1a6686c035b2522cc4df99e029a2352. 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/FRZ140726200.
The Firste Booke of Songes: No. 20, Come, heavy sleep
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838c056b0693d49d40eb23322e96d33092080c87c8bf23aee1c496990881b2f8. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ140726210.
The Violin’s Delight - A Garden of Pleasure