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 0x750c1846615bf511fb6e258dccedf3376a9b22ad7c2f9bd275d182a963157ef8. 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/f8b31189-aa06-4568-8b2f-4587f70b0624.json and https://artists.proofprofile.net/proofs/artist/f8b31189-aa06-4568-8b2f-4587f70b0624.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 0x77863e1ca4a311f184513983f14efcbd761add9040d8d36718cc538a527f2b94. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NLL150100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedd62eee0f2a536646fc0a6bdc8f18aa78af57f7526a0e12a147bf5d7009757. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/NLL150100043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a815a8f3c93bca41317e94faf4ebe9c6c1b1047708f36072e916be77f9bbc09. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NLL150100044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ef710766c2e9864b76336baf02fb8673ce26d26eeb884fedca41057d3378dc. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/NLL150100045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec5fe92f8c1a7783a8bb226ee3961abcc6ae15d508c2c2b534d577ffe4f97e4. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/NLL150100048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33235bab5ea5402dd5d0836fcceced681a637bb3a24d02b578f184f2ebf9fc94. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/NLL150100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0092462cf35e2abf1ddd16dedf4d89da73d44cfd95108dd108cd19b2ff53b8. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NLL150100050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029f44b300db99f613b8a95e7740cdece861ddacd38ce7bb07e754414cfc2f43. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NLL150100051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc571e3b049e16b49bb55bb2480b4f9a7df76b4fa0849bd3e176d8f535a4099. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/NLL150100052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f98ddc0faf77018f6a38a32f3e3761d4abae574c8fd5d116dbc39738bb0c0ee. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/NLL150100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941d26c5c310a442e048dc6c22af9208d07275590bc79a3f5337e854b6195f96. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NLL150100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bfab4ec5b58a7951390a15843fb051784998a9991085397544731c7fb4fa3f. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/NLL150100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279305489c176f3d8e9f4cd63b4280a3725fe19d19addcee768a21aef1582432. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLL151802838.