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 0x263540f2f6ee1d453a9a87af75cb684372b157d7e7ac4340621500e64814456e. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9fcb1122-e967-4871-81a0-cd55dbb27e05.json and https://artists.proofprofile.net/proofs/artist/9fcb1122-e967-4871-81a0-cd55dbb27e05.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 0xcc0f9087d399e54e356a21304cf1b0be6c7e6a9c84639c254aea06e2904e9dec. 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/CAJ722142602.
It Came Upon A Midnight Clear (Arr. Matthias Maute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3483f5587a81b41b4a139dee601f0a92963f4bb2f775dc89b794c8edd0d523e5. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/CAJ722142609.
Twelve Days Of Christmas (Arr. Francis Melville)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09b39c3f404312ad4d1001ee45bdfe3bd9f76f15abc641aa89308ea49266962. 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/CAJ722142612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1cc58bccf485f19a1f8758e777e7d5a080879a181cc56541d519b63e809b0e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CAJ722342305.
Kyrie on the Andante sostenuto from the Sonata for piano in C-Sharp Minor, Op. 27, No. 2, "Moonlight" by Ludwig van Beethoven
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb2cbc52442862555d475318f02961e20fed0127020c6b84f7f7fc9efc218ca. 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/CAJ722342308.
Betrachtung des Todes in A Minor, Hob. XXVb.3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd969e541abe4e9363f0bff92907da8fddb055274ef6cc391f22a1567db3bc5d1. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/CAJ722342312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a16b9a5038c3cc81f5c6401697e318b9076af7dafec28a69091072eb4f292ac. 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/CAJ722342406.
Sacræ cantiones quinque vocum, liber primus : O sacrum convivium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb868355a4ab85e00d69c9ebe0f8ec8db2a84f58534011be6d08ec470ea038af5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CAJ722442006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4b93dcbee8f57bc64c740ca83fdec75e8f33224b4c4d90f4e9ca44f7d778a6. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CAJ722442102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586a58ad344c14910a4e3a70703135cb819f34144b6d157701a4ae7acc1e375d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CBBUS2407012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118d8fbf1e0fbb9868e7fad769b709c1a0d9c73f4d2aac26f00c7c2534d2bfe1. 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/CBBUS2407001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2267722e82fcd2ab811659a85f23d3e2b34b7ebd2ab7823c090c419d6d508238. 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/CBBUS2407002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb318541ba1c3c3c95a95827a5740e2fab326d9db89698c08f9d7ef550f19ae92. 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/CBBUS2407003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d295762641bc54df8579df1a5d892931853691b20cfeb63cd0819e3daf1693e. 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/CBBUS2407004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5dac91dc830aa2cedd8e7f0aac38d9e47b2e92045cb60cb6a40b5baf3595bd. 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/CBBUS2407005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b127a8d4619c9d04539bcecf423d1da619f2b3fa009b35b503f92a573b4f65. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CBBUS2407006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffee6ae809b02e92c0e7504a8269a4e6edee87cd5c73a623351d2156d377a9ba. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/CBBUS2407007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba29a776496ef543b36fa354285c563afe92e79946893a9aac11a52ef2d0697. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/CBBUS2407008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f10280a9bfc2febcadc8c6bd6a0c8ae6887ae081e4a287d71a64f1a0a41a82. 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/CBBUS2407009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263f0b395d865edf045373f56c18e3ec16dbd3b812f1676c9cfdd6c058a1aba5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/CBBUS2407010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233885e281daf49ffb1da60770b4462de9d6403f8e20bb7605e19ae13dd6db8a. 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/CBBUS2407011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586a58ad344c14910a4e3a70703135cb819f34144b6d157701a4ae7acc1e375d. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/CBBUS2407012.