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 0x2777f18790caea5242582ea61dffc1f318eb55c7fb7400ecb8b6de3ce8cd54f8. 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/e53ffd66-4915-469c-9a0c-7a5212b2c05e.json and https://artists.proofprofile.net/proofs/artist/e53ffd66-4915-469c-9a0c-7a5212b2c05e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Catholic Classics, Vol. 13: Catholic Children's Classics
Sing with the World: Global Songs for Children
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 0xcd88834da16f10a6e19cd5a70c40e962fbaa61f14f24aa9bf0e04604553f86c8. 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/US7850810448.
Amen Siakudumisa (Amen, We Praise Your Name, O God) [South Africa]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8918a26bd5091a84450dfedc6b7766a2770a235e01b80dbab4e7cac7c176dce. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/US7850810460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbcf05f4d294ab3989c56f4f15d8dac907c609b6bdb6b089281adf09925bce9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US7850810459.
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
Catholic Classics, Vol. 6: Catholic Marian Classics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e074d2ed4befcfc8a54268a3152845beb6b13e4c4fa3eb5253da9b1ebff613. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 0x93aae6800e963c233531de969f60509e14e4dc357116cfdc4c89d6b56a79396e. 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/US7851010352.
Ave Maria, CG 89a (Arr. for Cello, Organ & Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b89b8c117a4f59bf7f0602dadc0f8911707f0cde852bffa62b057e0c1c196e5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2912c7f06ce81ba81015211aed31bf4845cfd01c6ea46ccf56813b04109fc0. 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/US7851010354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa987118ac7010eb5540c3a3914012d334a01cd70301c6d287be909f94d5f8524. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7851010355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e5a62f2bdd8561199febde2c27bf9eb9100c972fd22b8fe62911d5f0dfe92a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75b2aaa3bd025ddf64b124e556c0606f7df5dede5ab5791d47428faffface4c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6b6305d376b0f6a59ec96366ed0ff569cc6903997626afafb9b0e7a03872d9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc676fe4e63111645a1bf160fbbf1f6fdf7a75bd1166591a5bcd5738115d4c205. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87323a4caa2a79daaa832b7aff5b897b72ab3d2eb58979a85e3b0264f57946d9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86930467855ca5a06eaaa502f43bceaaf80bbf2211b9c0ed7923b66fb2d3e81. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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 0xd41b7d79c4f811954489efca3ee49b597239ea7f48d7d1910b3d5e57c34de8b1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd350c8c22d9498c2a67f9b24678a99cde0b045543addc25cf9d928020a9305a8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c6aa056007adffefbec57ae4eb3f0061b28529f193b36e346d4c7134540b3d. 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/US7851010364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633dfee3efabd47ed330111622e4fdf4bed2db077136e8ad35aaa053bc8d80b5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e511325f4b56475fb92ed80f4dbe00083b8c0ae26694ff590c32eb3955f6f2. 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/US7851010366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e1a6b2169c234083adb86bfbdb7c9a6e6288d749a7d73e3d9ff4ac43f93b35. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf109f22b7e23b1cc1e555404e85b26c9bb9c034d0a6f5ad262f5f94cc41d09eb. 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/US7851010368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ab61bdd3c5cc44d85aeaa36de1bc88cc24ce0dad93f0ce405efe490e7f55a7. 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/US7851010369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063b4a0f41a6dfa386f45a96f4684d561620afdc9b0ee89d5fb7bd792df12ba6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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.
Ave Maria, Op. 52 No. 6, D. 839 (Arr. for High Voice, Choir & Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a9e9799c3daf14d3b2bb8c348a0e574c4946a2798671ff3297a987bdeeca2b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851010371.