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 0xc1049c285283e7174228b60227ec4bd32e1a1a3fd7b75258ef09d61e06376920. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/86a6588c-e504-4b37-b997-2ab7f0d45c3f.json and https://artists.proofprofile.net/proofs/artist/86a6588c-e504-4b37-b997-2ab7f0d45c3f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Amazing Grace (Grazia) [feat. The Tudor Choir]
Amazing Grace (Grazia) - feat. The Tudor Choir
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 0x546a1c5c9e7e5d3cf19f92c519a7fbbae310bace5e20c3e43e3f4c9849aa8d82. 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/UKTF31900161.
Fair with Her Firstborn: Carols, Chant, and Polyphony for Christmas
An American Christmas: Shapenote Carols from New England & Appalachia
I Will Bow and Be Simple (arr. K. Siegfried)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925dccdb78834d3e7d4420c13527e80ca6cb71a0c963e115561bd7e894247f83. 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/USCWA0304101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4503ab7df3e9b501c18ac0c735909fef898c23aaab8c910796882a12b3d37e1. 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/USCWA0304105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7a0173a64d6cb8b6cd39824e58c10b58477fbe1f42729433c0fd963736d83d. 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/USCWA0304113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5778c98dbff9bebf42f6dd751507e63d46cb764fd893449a97d8c1fb9aee9bf2. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USCWA0304102.
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
Followers of the Lamb (arr. K. Siegfried)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a2287b176290a91a9d06cf53a1929b9c17bf496f4a5611a9c8dfba58e6cce9. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USCWA0304110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca25da64fd6295349e6125ad1d609bb10ca57fa9852e6d1381616511e5d799ad. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USCWA0304111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c379fb290d1d7c7eb46d0dd21aad1de65681ef880816173a2be3eb3e1f7e6de. 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/USCWA0304122.