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 0x7498046942b8a02ac6821d5ec1c7af337eebb40f3abfa57c60e75e3b3eb10787. 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/cabba469-ec51-4c90-8925-4b157610790a.json and https://artists.proofprofile.net/proofs/artist/cabba469-ec51-4c90-8925-4b157610790a.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 0x589107baebee46e936de9b1467baa03f26f1d09ed812791143f5ca1aec5d22ad. 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/FRX452369400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058638b91f50317c3d5a1648e2ca53619b9f48321af41dbfd7f6089ea2068300. 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/FRX452369401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ecb0f168946ccbcd1eed2c2d1beb8c523308356261bc4a916278e5dec59f39. 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/GBRKQ2039065.
Toolroom Radio EP669 - Presented by Mark Knight
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b27aab5176776c805bfbbd76cd1b6efedce7838c347e957c14cdea3925ebdc. 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/GBLV62422025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179bc20e0ea00df321da9315366773d37ea814f0bee335d363d28350d61c8996. 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/GBKQU2494980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b709878f45cf7c87c298544158df04074de3cdd809f3385cabc6dfe68033a3. 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/GBKQU2494981.
Calor Del Foco - Francis De Simone Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfc65fa43c9373d29c5db30b0cdd8cab8e024c8f7bc15efafe949288da60f3d. 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/GBKQU2470665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3d77a5144aaad06adccd6679f634bc62d3fe89a25a8614bd5a68b8f522340c. 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/GBKQU2470667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50139eb3d485a8af74887828102daeba4e516be95f1c4be540d1db73dfae627d. 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/ITA061302699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143012c88cc6efb06c426642601d307d170ff9d7cdf300dd82d4a50b1564bd31. 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/QM6P42479084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5007c1fcf52501b6318696dea2870175a5987135d6d4ba7113f21ede0b02e350. 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/QM6P42479127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbe56b9c94089f266d32a2f5cc0a834c8295e196390972b1677ad7dcd9d7adb. 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/GBKQU2440975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7781396ca114ad97b4594492017d7703cbfa804e246642a84e41ec9ae61c3dc. 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/GBK6Y2451233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b574f90552cc654482aff61ce5b4bba1995975614177a20390795912b5e4a3. 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/GBKQU2493918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc01f7f85224ea7c66b06a545452932b057d6247e489a0a68f8f415fbd0adba. 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/GBK6Y2219701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65705f7b9ade2fc46c27f1e4304169350199d46b3ad9307c9b6b52ddf8091e5b. 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/GBPQS2200066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b35012142ecbfa9c5c78623f0b3e5973742458225d5136b7af779fc809e3606. 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/GBPQS2200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ff7a7e61e55bcd55a478f37fa49501cbd5a5130ee505db4bceaab8ea7214e7. 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/ZZOPM2233106.