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 0x4d626362cca37df50abf634a6773d61aba8f77dc25045ebcd5eed6975054d7a9. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14f5c7bf-f425-489f-acf3-9fda9cc919b4.json and https://artists.proofprofile.net/proofs/artist/14f5c7bf-f425-489f-acf3-9fda9cc919b4.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 0x438097149dbfccb2fafe60ad0c160617d259725d9c5329cb1511540d71fe20a9. 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/US2TL0923401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32caf00fffec16e9def728ecb1afe5795b35c1f97f1eef472801997bb29f602f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US2TL0923402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f8ef999784fd4aa713f9eccc24858df1cbfc53f744b91ff3df218f694d1e68. 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/US2TL0923406.
Hark! The Herald Angels Sing: Festgesang, MWV D4, "Gutenberg-Kantate": No. 2, (adap. W.H. Cummings as Hark! The Herald Angels Sing) [Arr. W.J. Cummings]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc485aaf8abbd5b4d0cae21812e28776061c7f3b130c90bec0bd4743abcde6cbf. 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/US2TL0923408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36294629e991218f88186b3775569b8ba0c21f80c3830bfba23da2921cf3de5. 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/US2TL0923409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec82588299c0eb6d3bd487cacb2558f8c9a1069ad3ff05568028ef08def047b. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/US2TL0923411.
Silent Night, GWV 145: Stille Nacht (Silent Night)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24b01e289bb1a86f27433f856d321f1ab67523c45333419e5f8de6b1fbd40d3. 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/US2TL0923412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1607a0e0aa15ebf94a27b040eb7dc860e4ef9c9440b1b16d3111aad9c277883d. 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/US2TL0923415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f9f17d84102ec13c00d153026c2f688d4fc8600554b045d9508d114e68ae16. 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/US2TL0923417.
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 0xffd112aab3e7c92294b2cd910fc3c60ee9294f96bffe3d129edc2cf00adf8074. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/US2TL0923407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e056d01eed3191b4b3d3c168f690ac3a7ce735a8c132e068cd0be2652c81768. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/US2TL0923414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb4dffb02943046437e9db0c3245c64c54566b0ba74cb3ea621bddeb5d176aa. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/US2TL0923416.
Choral Music (Sacred) - Handel, G.F. / Mozart, W.A. / Schubert, F. / Haydn, F.J. / Herbeck, J.R. / Bach, J.S. / Bruckner, A.
Vienna Boys Choir: A Jewish Celebration in Song
O du fröhliche (O Sanctissima): O du frohliche [O Sanctissima]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4e7cc1dc991eeb1f3f40ee10509d52bbce0539066ec359a0101c4b4696c29f. 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/DEB261200973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864c6b4cb1314175c92cd61b9835e3a87cfc33680c2b739f1321f2f44186d11d. 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/DEB261200974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d5ccd5bfe75590f85f822f395d5e092d8dfce2637fa1725c13b256aac9f5e7. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEB261200976.
Tauet Himmel den Gerechten: Trauet Himmel den Gerechten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921df9b368c2bcc9691c8960c2e52abda5b4c167e1605f2aabfaf598008539bb. 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/DEB261200977.
Judas Maccabaeus, HWV 63: Judas Maccabaeus, HWV 63: Tochter Zion, freue dich (Sung in German) [Sung in German]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7975f59ed4b38333c20d23861c776aa6d8d2478c4c512175ef1ee4344314e9. 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/DEB261200982.
Vom Himmel hoch, da komm ich her (from Heaven on High)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3edd47c2e2b299b2ddf08e0a84a6b36cce309e3df14274a35d77e84cf79f3a8. 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/DEB261200971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c8773c6827f0da0fd3cea4af9859333e59a30652afaf269b01bfffc598d01b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEB261200983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0265f8b35984c273f3f83f92c508194a905cd6baf3a269c96757eefdc02b34. 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/DEB261200986.
Once in Royal David's City (Version for choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5f4f57e4ee9d0ae95641a7c606a9318169d2fc8c6be9137bc0218db01bce6c. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/DEB261200991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7500c3b40d4e354360ec4bf06f6cdf238d01555c3248a61d4fb6f27131f88a8. 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/DEB261200992.