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 0x66c40ea55bdda1eda6363f1124c183620f78683918c02299f089db8e211a67aa. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c4e2d50-e446-4c2e-a69f-32a2022849e1.json and https://artists.proofprofile.net/proofs/artist/0c4e2d50-e446-4c2e-a69f-32a2022849e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xadc5167b72c8256b8bfb45493b06e5d0576997620ce2cb1301639dd79600d135. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/US7851301252.
Catholic Classics, Vol. 6: Catholic Marian Classics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e074d2ed4befcfc8a54268a3152845beb6b13e4c4fa3eb5253da9b1ebff613. 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/US7851010351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2912c7f06ce81ba81015211aed31bf4845cfd01c6ea46ccf56813b04109fc0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US7851010354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e5a62f2bdd8561199febde2c27bf9eb9100c972fd22b8fe62911d5f0dfe92a. 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/US7851010356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75b2aaa3bd025ddf64b124e556c0606f7df5dede5ab5791d47428faffface4c. 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/US7851010357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6b6305d376b0f6a59ec96366ed0ff569cc6903997626afafb9b0e7a03872d9. 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/US7851010358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87323a4caa2a79daaa832b7aff5b897b72ab3d2eb58979a85e3b0264f57946d9. 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/US7851010360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86930467855ca5a06eaaa502f43bceaaf80bbf2211b9c0ed7923b66fb2d3e81. 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/US7851010361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd350c8c22d9498c2a67f9b24678a99cde0b045543addc25cf9d928020a9305a8. 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/US7851010363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf109f22b7e23b1cc1e555404e85b26c9bb9c034d0a6f5ad262f5f94cc41d09eb. 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/US7851010368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ab61bdd3c5cc44d85aeaa36de1bc88cc24ce0dad93f0ce405efe490e7f55a7. 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/US7851010369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063b4a0f41a6dfa386f45a96f4684d561620afdc9b0ee89d5fb7bd792df12ba6. 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/US7851010370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20436cf469875ed9b6716e90193746342d5a94a4e096cdaf8a8336fd6064f50c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TCADT1830316.
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
Resonet in laudibus - Schlichte Weisen, Op. 76: No. 52, The Virgin's Slumber Song (Arr. R. Proulx for Choir)
Catholic Classics, Vol. 8: Catholic Christmas Classics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6decb5ff9e15e3ff1776509b9b94aa936f7572a84e1761630ebd7730d5fccd5. 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/US7850810367.