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 0x2c1727e9ce9d9d187dad74319128107e55116322ce50dc7990789d2766e82d79. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dde54510-6afc-4105-a22f-9d01632678aa.json and https://artists.proofprofile.net/proofs/artist/dde54510-6afc-4105-a22f-9d01632678aa.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 0x2796dcea401fe615c8947257fe5c218fbdaaad843a6e62fdacc91fbdee796920. 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/HKI498735102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5001df0d9a3cb984d4685065ef4acee4aa44ba84cd662d6daceeb7c7db9d85ce. 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/HKI498735101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2796dcea401fe615c8947257fe5c218fbdaaad843a6e62fdacc91fbdee796920. Chain 2 (Bitcoin): anchored in block 957236 (2026-07-08T23:38:43Z), 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/HKI498735102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98957cc638bd229513161d557debcb7929d494dd148b3bad54000d5441044b62. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKI498735103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2796dcea401fe615c8947257fe5c218fbdaaad843a6e62fdacc91fbdee796920. 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/HKI498735102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5001df0d9a3cb984d4685065ef4acee4aa44ba84cd662d6daceeb7c7db9d85ce. 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/HKI498735101.
我愛經典系列 - 夏詔聲 & 陳潔靈 (Danny Summer and Elisa Chan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb89e736c0e91bf723eafdad40bfc9752d3eafd9e05e2342f4a995c0a217aac. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HKI498830102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1080052b0d62a08d2d35307898a94a51f8649ebcd6405f9c9ca01d8585059d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKI498830103.
Owen Kwan, Chris Babida and Gordon O'Yang at CBS
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23284abb40a58029a71c90a66b38dfe568f74fbebbb9b877562578d14303db17. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKI498730109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1080052b0d62a08d2d35307898a94a51f8649ebcd6405f9c9ca01d8585059d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKI498830103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb89e736c0e91bf723eafdad40bfc9752d3eafd9e05e2342f4a995c0a217aac. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HKI498830102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa716fe1097bd658ff3118c726a00648773b445cc0ba91059119b7bb11c45bb5a. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/HKI498830101.