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 0x75c16a668b0ac06474a13aeb050ac52b66c59783bb38ef463693bf8ca0724ca8. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/53e2a6c0-7a0e-40db-88a9-532edcaeef7a.json and https://artists.proofprofile.net/proofs/artist/53e2a6c0-7a0e-40db-88a9-532edcaeef7a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Puccini: Turandot / Act 3: Nessun dorma! - 2007 Remix
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 0x710dc33af3e797b15c5e1ebd038d4e415b4acb59acc2f417c14e20f3a253fd9f. 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/GBBBA0742150.
Offenbach: Baracolle - From “The Tales of Hoffmann”
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c6aa4a59e6af96b331067f8abeda487ce8240a0b79a18600bfe3d7e3cd4e83. 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/GBEKZ0400339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c94618b5a61befc1f89cec5db313e0eb8823c211636e41d58551ec53a1941a. 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/GBEKZ0400328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59483155b52c44491df30f9dbf7e72523bcd7b3000fd9a95cb0dab2e01158f9c. 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/GBEKZ0400332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59483155b52c44491df30f9dbf7e72523bcd7b3000fd9a95cb0dab2e01158f9c. 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/GBEKZ0400332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20818665e25ebeab3ac65a62b30a29b65919594e724b932569fbb69e70a412c2. 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/GBBBB3700001.
Chamber Choir Of St. Catherine's, Bramley, Guildford
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc8ce080bcb33413a5e78f7703f57282946e043431583acf2d9f936a015e167. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBBBB3700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31300465d8f9fe48c33415f85c4f02906306f1f445cb8866bfeebc948b7a8a6. 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/GBBBB3700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb485fc64af9bc3feede52557dd84cd6f9da49bc026cb0c1f270527a8b064276. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBBBB3700013.
Puccini: Turandot / Act 3: Nessun dorma!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b14eb860160046f3fafc1ebce7c08ecb5632329f94234b64daf321876897713. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBBBB3700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20818665e25ebeab3ac65a62b30a29b65919594e724b932569fbb69e70a412c2. 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/GBBBB3700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710dc33af3e797b15c5e1ebd038d4e415b4acb59acc2f417c14e20f3a253fd9f. 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/GBBBA0742150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d58a0af4aad4b4ad01884649cc0b39d0d73d3ae9d8b70311177e53665bf75a7. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/GBEKZ0400327.
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 0x19cf75fc5ab4d7cb6efcda516832004d2f99d1ad4bc5134e43d5a7cf4666875f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBBBA0742040.
Schubert: Ave Maria, "Ellens Gesang III", D839
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb633b6da63ffe2096048f5541f0a6440ad3dc9f3b9f7afe56facb2c85c27b61b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBBBA0240605.