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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9421f834908400b5524e7d1c14b00c0c37e1db1f2745ebbc5dd746998b863994. Chain 2 (Bitcoin): anchored in block 953783 (2026-06-15T12:24:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5b77bae-0111-4898-b293-67f181289ebd.json and https://artists.proofprofile.net/proofs/artist/d5b77bae-0111-4898-b293-67f181289ebd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Klag-Lied "Muß der Tod denn auch entbinden" from "Fried- und freudenreiche Hinfahrt", BuxWV 76
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73598e502e89827445bf9c8d8daa7635596d7d1a3c9abf54631791384afd555e. 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/FRZ149765060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97114bf662d3fc6f88d5f6e9801dd24a02fa234abf0a26eff81e1aa333a6b274. 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/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 0x8ce4e45cff21e6e6bbc3495716b1cfcb53dc66b87100fe0d4724febcfbc8de13. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FRZ140726060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35106a17e9ac9ff69ce2c9e00a7bfb1b2e8f25fbccbb1ff09a82f31c7aef7e0c. 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/FRZ140726090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db8e755966f529871366c6b5ab64617af7f2be78a1e5045a2855fa0dc31cf16. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FRZ140726100.
Venus' Birds: Venus' birds whose mournful tunes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca008c7cabc36057b06141abb6ddff39151cce206a30ae5445aa93e165bbabac. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRZ140726110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9795ccbbeb508e9bea1d4dda151d94c43203e6b1951f8f5d5d7a87f93e04ee13. 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/FRZ140726120.
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.
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
Kleine geistliche Konzerte II: O Jesu, nomen dulce, SWV 308
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a2bf30835295e45000123048d8f2e59d1521621bae9362f8d77a9be5225c80. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FRZ149765010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fac686305251c2b4569d44ac66f82433889b780ea7c4aecbf019770c595664b. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/FRZ149765020.
Lamento "Ach, daß ich Wassers g'nug hätte"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74510e49c5c76d1b48a81c0722fdcedaf13935aeee114589b1c5ded931ec63a1. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/FRZ149765030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbf767dc5eabc6f961ef20082569f04730af62be645f7a349d7089c66fd8a5a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/FRZ149765040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539a95b6e161e1ef0e32ac94de5ea9ec78bef81afce8fde6fcba2ae0d1fba00c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRZ149765070.
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 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.