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 0x657523d7e90476f10e7a4ff1a41b3a244e0528fdc642ebcfe334878438afd00e. 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/8ac075d9-1f64-46c6-b56a-b01cb87de31e.json and https://artists.proofprofile.net/proofs/artist/8ac075d9-1f64-46c6-b56a-b01cb87de31e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cockeyed Optimist : The Songs of Rodgers and Hammerstein
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 0xc10e30be8859dc519fdb7c99bf789c18fa943022a44b69f4f2f6b97bb78f1c76. 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/USA820500066.
Mrs. Doubtfire Original Broadway Ensemble
Mrs. Doubtfire (Original Broadway Cast Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f06102be97cef973ad31a5599b34c10a96b0288028c9442cccd1a3d0e0a33bb. 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/USSK32243017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4024a18685aa1f9ed6a092f4754e192fec4c2e83b1811f516df2fe0f0bd7410e. 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/USSK32243024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde89fe42a788ff625996bee66bafcaa91a06fc16e3e80381671d826e5e4b97e. 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/USSK32243026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99811897816584876f0e520dd1efcebadc53f9667181af921f0fdd119c769123. 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/USSK32243033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61507ba7a4091d0cbdc08aa67633e977b7ea52957274df5653d6de769212364. 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/USSK32243035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0e20e469faa8fe4495819e3860fbe7bfabd83211b20055b7c1fa940faf5fa0. 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/USA820500050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a993046e16afa7584f47263519270d31b971d8cf49027be5999ea00244bc2c8. 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/USA820500053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d64d00a5879e849163327966599c59ba0dacd266cc695b57625f315609b7eb. 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/USA820500055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2f7ca5ed6afc878698ebe29641350cfe19f2585f7edb52dc2953c8428484f8. 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/USA820500056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa9cec95082d77437c680cd07599d1f040107ee096cca6199d07dd9429127c0. 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/USA820500060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0deefd686fc771864d91663b8c19bbb86071b4735d55647f42431104426fd5c7. 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/USA820500063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53668e6e1a0aab2250718788b83ec6cd119fdf6b4069ec3c5452788e653c966c. 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/USA820500064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed50626ae04df93968175c9f61d476648de79fe6b83d7201d251e4b4a00b8c4. 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/USA820500072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2463a852b474729fd8bed1e1d9cc9195c1c716149b6bc99e3f837560aa0db0. 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/USA820500073.