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 0x453a36bf4688be6eadadd9c87fd67c806ab6bd9a898f7683c693947dd7a22cdc. 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/7decb112-cfba-4480-ae8d-9bec31503744.json and https://artists.proofprofile.net/proofs/artist/7decb112-cfba-4480-ae8d-9bec31503744.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach: Mass In B Minor Missa, BWV 232 - Kyrie Eleison
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 0x2935851016fabb81eb134d71f0ef014d3ea5b0887290231847d866978b676c1f. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USKO11200404.
Chamber Music: Alvin Lucier & Morton Feldman
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac394ed641db801354b466a7657bf87f0281fe7cf3a90b86182746b4d6a1cfb. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QMQQH1910031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ade5d07d7edb137ba24662951932ea0945dd13c739679bd640aeea858b9d00a. 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/QMQQH1910036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214f7ab44dbda7aac5a161652ad2c7bf6d1128c2c64bc02db4a05c960a470a12. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ISV441004101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7a411be38fd0c2f7aba4bedd571dc081d5579a8cbde8a4d45be6f0a34dc058. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ISV441004102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917f6457080d8992453266fccfb96cfe96dafcd575d5b3f1a29e4ac78aee485e. 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/ISV441004103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f82cc8f535ba596304c8d0d17070013840afd0309de7f90f7719e7519ec6de. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ISV441004104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a67a417a845fd324fcb00a060be2ca504d0104965a36ffd2287266a80ab259. 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/ISV441004105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c452f6b21dbdefbe9790f33f77decae353c85c59535947576f83deec95fb3f. 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/ISV441004106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aff694b16309e7c9d1728db631a26e80ef7a76bdb4e5406507341ff4ca9ea4f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ISV441004107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7fe9f336ff3536250583b257e41f06202fdca18fadf18cde274901aa17c93e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ISV441004108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a6c3efb1dbf2fe7c588e296505c33725045ae8ece7b8db483156654328c765. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ISV441004109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167215271d56132968be281f8af784cf8569afe12829093e4c0d1631a0c99158. 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/ISV441004110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0528d9093e978d8ca07c6a4c98d5fc03f36d9591197b1508f44b64f22c5b33d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR96X1701370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a9daee16d001258b96875a431cf4148bb590a956f2d0d9fb5fedd4b09a429f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR96X1701371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9642abeaea59aa283bc7a675d1f0706f664e58949329cb42db07cfe70d5f69f. 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/FR96X1701372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ba2a65b29c710cd074854f7e5e4b66352a05b9cd9b5342cde56aea61460188. 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/FR96X1701373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d82a6a491b8434a997143250a0a55054ff803ea3950c39710b022f4c4129bee. 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/FR96X1701374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a16007714caedc848021b17797db0dbf530638e936d52b84e26d74f9dbcdf8. 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/FR96X1701375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff584b7ca5647bef40dfb30e26e5453e89b198c83192e20dd7d3f2bc3fbf5819. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR96X1701376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3511887a3e0ad3e6fd1daeb153e0f33b59dc32ab3864beccb8adc822f570326e. 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/FR96X1701377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adcb78d794b7daafc672dd0ce9882635d7495594d4e1a41c6e3cb76268fa4d6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR96X1701378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1253cea2d85a512b5eb2f7366fde2a238c271fa94adc57b7272c73d93c44d49. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR96X1701379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a2be991d55d3e6496cea802a8dde6e62450422dcde19039e0d4f97978aeacc. 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/FR96X1701380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9483e0555b9a80d52941ffaee27479cd7584086393ac314f0c8567a5edeea19e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR96X1701381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e5f34d7bfa5ff4196cba68ef8e4eb5b171d22369b77804bfe1eab268970bcb. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FR96X1701382.