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 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 0x4a1ba9f0400b83b989cc9b557ca815b5faf3e110ae627e41f64a765b730e1c7a. 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/e8cdd3d0-d053-41b0-a30f-e52f234410d1.json and https://artists.proofprofile.net/proofs/artist/e8cdd3d0-d053-41b0-a30f-e52f234410d1.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 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 0x709fa3ad96941668ad6e1f49538ab675b8388566a9a635af7de5390442523add. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/TCAAZ1100266.
No Pianist for Assembly? No Problem!, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3150cfb2a89b0f11cd80e6482972f9f9f640f155fd99f0538f0cd828fa6b7bb1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBRFW1102372.
Just Instrumental Hymns and Songs for Children
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32271caa94bcbdd68a09fbbfc23dfc1c6dc083067ccb5a16d6a38a3517cd7d8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCACB1460524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dde5b70e7d647cd9e2d36922ec218218460ff85fe7785cb53b1edc7248ab20c. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/TCACB1460525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5366da47e00651a31e4df8a52148db39c13a90d074f891d921b7437aef308306. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCACB1460528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7a67e7f1b9bc979eddb2e2031952f3b79b3c3dbd077d1f3bcc207118ae189d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCACB1460531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe2f137a2ea60a9dea12295ee3bbb09e21a9a435d8420685e05e7913792fb73. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TCACB1460532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16cb86dacaee3bc8dcc0aff646e68aeef86ab445e06ae0f717136c432cd89719. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCACB1460548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d3ca14fb7f689dca3a0633a379ea68d7c828b75093344983385535052eb8c3. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TCACB1460551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3a6763dc204c988f743dbbabd3970bdbcd824309cc5d6a69855e6cfd0fa2cb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCACB1460579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2964ed2e64026530657dc9d1cf369fd818b41c8e1e24e926d5fdc74a7c167917. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCACB1469074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31addb92cee548480cf50c677caa22db5206bff93e5e30516683c26e2a1cec61. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/TCACB1469083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfee2e4c3626ea244a0516639d7488824891aedcdeb578f51b1b8170eb253922. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCACB1469085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad6846640da56b2475f147b4fd16372e0f43aabdcbf72334f619a1c6f1a14b4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCACB1469091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2fd5764c7cf384ee017a26fcf1f8fdf1818541bd90999b0b871d0d848951d2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCACB1469096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc6894154b885a25ddbdd61fae4d0a635e418b61a26018d5b9c9bb6bcb0eab4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACB1469101.
Just Instrumental Christmas Carols for Children