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 0x2a7d08ffcf2b71da7653496b734d47713ee67b6998a2bf20e41d092113add775. 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/4b7aa8d6-0c5a-468c-866a-427bc854054c.json and https://artists.proofprofile.net/proofs/artist/4b7aa8d6-0c5a-468c-866a-427bc854054c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dba3a57a09145aa13a0d20dc70c3918b1b1b96d9b62a095bafb8260f43d0fa. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DEW741312007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646de872f7dfad71e478eafb523bed2029f864a242eff1c106aa64d05570f167. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEW741312009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cea92f61fe5a75bf9e51cdc7cd440c105e6176c1be59ba7bf7ede727cfbc42. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/DEW741312010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0c102aedf15e0287687143ec3a1f89aa225fd157c897f574ff6882742834fb. 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/BER182178401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2660b1a4ce9ea68ae8c3a188dcf6c2735dd7162640677104007d2acf48a68b. 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/BER182178403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83ba057ca923490106e4e1c7a7276a628552632f359b5a14b80fb32c21395da. 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/BER182178410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26901c00257ae9bfbab691bc7780a48039cb5d9b31ed22145519544fce3af3c4. 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/BER182178412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5147dd04c3ba2a9765ffad03e44b44982842f98b40c62473d6aa6730fe9c56. 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/BER182178413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843274084c8c5ce810097faa76221cf9a6b9b45b1b94785d417bc15e3aad2d23. 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/BER182178414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4138585cc6442f82fea465e461bfeef0f0ff89b76b59b3a9ba56b491506a081b. 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/BER182178415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a2a5efb8c0aea728bc2b900af6445020fa30547ba0246119f866ac2d8a09c9. 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/BER182178418.
Have You e’er seen the Morning Sun? (Arr. for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b7e100ee5d4ea92be041f62b458388c77138fe73789d9c13d3ab107c6d55fe. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BER182178402.
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
Here’s the Summer, Sprightly, Gay (Summer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd655a6f1cdc0e6a9afb0412ce7385c0395b70c75e4a3948636970e49116c7633. 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/BER182178404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099ad08e1749f0d74763f79f9000b1a9df940713022ad9289b01ac2f6fca3972. 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/BER182178405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357a15c231414a66b4ac37f9af309221cd2fc10b65d58259a5347a95596b96b7. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/BER182178406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774f1e4723e65cc3ec6862275c2812afef17c48cd32cd8b8029d4db109a685be. 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/BER182178407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710dab928cca2ad79f53437a95855cac8c30ce065a1bcc4f4d180bb6b0e607f9. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/BER182178408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ffe8f9cc0bd18fa0ed0ed302cd559cf7b1dc3ba1f81e96e348a24a4abcd9ef. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BER182178411.
Jahrkreis, Op. 5: No. 39: Wie der Hirsch schreiet nach frischem Wasser
Hugo Distler: "Totentanz", aus Geistliche Chormusik, Op. 12 (Drei-Und vierstimmige Motetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cfba2fec2f4045fe4edd21f5b1e7b5111884c4ec12202267976ec8722e8ea7. 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/DEN421220021.
Geistliche Chormusik, Op. 12 No. 2 "Totentanz": XIV. Vierzehnter Spruch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fef079470a7d98e032f4c0998785509a02af6e1dafae921424b1fea34c81621. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEN421220018.
Geistliche Chormusik, Op. 12: No. 9: Fürwahr, er trug unsre Krankheit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9a046e971ba2dcb753cae54eb8ede5b7638c0eeb3d8e9dac5aadd3fa85d641. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEN421220020.