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 0xccdb7818ed0a179db272722e8544e723a059005a08ada6bf435c621b7d154ac7. 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/72763e44-69e7-4b89-8319-28aacf388a01.json and https://artists.proofprofile.net/proofs/artist/72763e44-69e7-4b89-8319-28aacf388a01.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 0x233a5af1c352bf2d5e95113218b098055bdf1ac27ee8a31a14ee34b3d8b4c3b9. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/FR96X2468654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057e0a34bf1fecd4cdd43d1c6634d81688af559783ec250ab9c51c1e4b3325bf. 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/DGA0L2389009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1eb11239ef905ef9f5710e3505cc0aa1f1925b6b078f353aa3ed736c18f875. 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/FR2X42360262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854f245adb84897a28c3741d782d6aa4920147b86931447032dfe0bd2ed34a0a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA092201522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89286a617b57ca6edbfcd8a11bdf169f3b5c97ac2b4647272ced829fd6c0c0a2. 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/DGA062245265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab537e539828a4a845e52010c63d79b69871be9baa836aad3b60c1b62169a3d9. 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/FRX452206858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f2dc9a0cb75705dc6c2c29d707bb42a50626e46e82da842d84bff032990789. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRX282280544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0ab223e08aa34e0d862b42a6d4511b4bbd14fe4b524093e02b0d21001c6d0f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FR96X2279031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39ee208059883809bcc0613dffc6478c662b1bee7cf71a04e627f1dfc1d9d6a. 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/FR2X42267351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77903b1d2e8f8a32cdd55bf9273a6005c5901c37eca6e39bd7eb536d72340d4f. 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/FR10S2214259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599aae1e80503dd4e51aba6ab82bbe18dee696c7aa973791d35117398b9fee50. 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/FRX872155042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a645cd99d45de7a8dccd7ea53d0b05b93c8ef2a7f4f41661d31ee1bce4dd58. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FRX762110866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44d751565bd9c2bf1d4a3f8e6cc40dadbbefed435d44229ac8a4596cc3e2b90. 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/FRX282164756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7848f1a7f0f1d255fe61dbd49d6ea5a7bfd0977700c312454e48b21293fa289e. 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/FRX202177652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917b96678b668a7c0a460f549e781f78337075b1345933b7add7270be0dd6acc. 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/FR59R2196861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9300abbf431440a4b0daa5e814d02ee32c1d0ffb197be198f319ca4326a52d. 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/FR59R2112888.