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 0xf71bc8694bbde6df3972c71b977856620c2534fc5bd2fed7e1df5b1b31e5ac7e. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e710c37b-1a59-4c76-8472-831ef806ea23.json and https://artists.proofprofile.net/proofs/artist/e710c37b-1a59-4c76-8472-831ef806ea23.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 0xb222aaada37bbcb2fdf2201ced625f01b40d25d2d5300cc567389ea5c1bafb12. 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/BR3FI2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42d65d0ac61e36754690a7881116e115a3be2ee5ae8e819c7cb4cb1a67c03a5. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/BR3FI2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e762ceab512879afef582cf38b29edfc17b52c577d85d07eaa0df41bdd9764. 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/BR3FI2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c33173e10f45464e1b840a7519a4e0b3b31afd3641118f6e73b816591674dbc. 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/BR3FI2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7831eb209b07b783d0e2ef7c5c3d60a018b51cbd17673d1ab83818a551e05ff4. 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/BR3FI2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935adc9118ebbfc6bcb142f240b717df20f619ea06216de9683f8637f7e8ac1d. 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/BR3FI2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a158b624c3ddab173e39a0a99d29aee86be3a76d28ae7c82bfb849d70b0084. 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/BXIGA1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e762ceab512879afef582cf38b29edfc17b52c577d85d07eaa0df41bdd9764. 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/BR3FI2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb222aaada37bbcb2fdf2201ced625f01b40d25d2d5300cc567389ea5c1bafb12. 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/BR3FI2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a884ccafc0216ff07fc1176ba0668e047a567cb29aa7a42d9f23767273eeff7. 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/BR3FI2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d2881ec7b218c2448dc40e90facad1e27809279b3fcf8f0b71fad6a3c060e1. 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/BR3FI2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d31df6d36120bca12586317074a01fd7227a434a75eb6087a627b333098aea. 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/BR3FI2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935adc9118ebbfc6bcb142f240b717df20f619ea06216de9683f8637f7e8ac1d. 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/BR3FI2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242e2a61e5c7c2885db634013c2274451edeb648902b58bef5282b3325416a8a. 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/BXIGA1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a158b624c3ddab173e39a0a99d29aee86be3a76d28ae7c82bfb849d70b0084. 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/BXIGA1900001.