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 0x86efd51a54f5059e0822f9e37b7fb263e0d187c421c88b5ceec77d2d872bdbff. 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/24a1e103-2f51-4ff4-a7c1-12cbbae6f13a.json and https://artists.proofprofile.net/proofs/artist/24a1e103-2f51-4ff4-a7c1-12cbbae6f13a.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 0x6da9d2352c8f0fbdda46ccbce3c842261eed8e71f70d374521e5802d086357e4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZ8LD1941471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d02b5280a1a2e6b64b1333e6364f7c34dbabf52f9a58e7b3d50d438edf996b5. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/DEBL61250492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd956587286e241a233696576e0dfbb6605e9bc6c713057e8b2cac129d0c16f2b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:50:34Z), 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/DEBL61250498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829b8721375b9385b1e4e2102eb3992ca98d3013e8bba6324b1ee5106f0772df. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/FR10S1567310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e11aba3b3f83589aea06f7e887fb399b910d1db7bbc2c4de183ec92de8ab4b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR96X1936697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7436711dc6d003f3acb34c0c0d1ed626597f4ff391f069733be82098dfb3c9. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FR96X1936703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e66729c3fd83543fa216666fde319722b73456cb755283d319d43d2ef2da0f5. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:58:48Z), 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/FR96X2478023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb404b592867078433ae35187354038a4f021e7e06683c1f1cf9c9eae099cc2f2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHNC2363737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a62004da6b200295d1f6b4c2f4a235799bd89d46179f5649b8c16933d84057. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZES52398995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3085d095a48941e848447886ce2fa819e941424b5ea0921c61b2de2b1d6bf948. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZTAX2381617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33bd18adcc73cfab535c29db6a8592c6909ef23d9afbec6b6e02e6ac912150ff. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:38:59Z), 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/DGA0T2448401.