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 0x95454dc267dd32d494ec20a004b561a5acd0a11dd322d5eb3191182928fe5527. 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/6b1e2814-6a6a-4e6a-97bf-9ff94fbbfb81.json and https://artists.proofprofile.net/proofs/artist/6b1e2814-6a6a-4e6a-97bf-9ff94fbbfb81.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 0xe1546622bf9f68b96d53892b3e35f6a5c972d7d950fb45fcb37b06fa7016bd0c. 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/NLRD52355093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a08f9c5738045a2dc9c8150a7ca3d9ba3f58059098450e2f7f9782c4c161c60. 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/NLRD52355076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d77c2db3dd71e9ee71baeb3e180defa79e059fb57a9ae89b432e1cacfc9a951. 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/NLCK42237237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb320b3afe76bf3e9fd1332e8842da78802ac84af8ac91879a23de410c2a0b8. 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/NLCK42235774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650c8cc30b56ef3a20b5833655255b781c08b1d74ce1da2c64e57e2f1fbc2acc. 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/NLCK42216862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b24e3b214ac9567f39bd34ef8f52b60eedc494808ddc1f868672c8fba82b3d0. 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/NLCK42216393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1e459bc79600a1757b07538e0870d6b7d5e1f84c96a631dfa52447f49c0e2d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLCK41090428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf947536f01a7481bb546b4243e3ca85abdc4987f607e864d557f2555fc6083. 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/NLCK41090429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357f9952099508094d6c4dbc1bce679c52a33d0b7c8b2c6cb0bf1ca5b6085b5b. 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/NLCK41085917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9f1b74218a32bd62355839a0288637b249116b8c03710fb263689b9b055bac. 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/NLCK41085921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b53db49b655b2a3a1c7b1035e4ad553d992f07a375a1a7a723c920df85e1aab. 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/NLCK41066954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce9a5137804673372d510ca03e65c6b3baaaaf04da8ecebaa12327201458bc1. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/NLCK41062778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861c7b47d86bbc4934cc773bc1120f496bc2be527a468c4c3666ab5bafd50c1a. 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/CA5KR1949089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b9e75b0014354d03ad9c6bddbffa3fc9a81330c8419dc267f18a2b2cbc377b. 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/CA5KR1949088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115ce3e37bb90e02a256ab6b215c1a94fe8bad76860f997f8062f2aa7e5d59f3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CA5KR1949090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e20bfc59830ae4eb740e208ab04da8e484412c2ece7c6d4f68e6097d235d53b. 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/CA5KR1949087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59481ed503afa331e757999db77656ce59a8683bb50c621d1eb2c81377ec7f7f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CA5KR1808517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160483a1a5dca37bca735fa371202b1d59efc2b668ebc8ca6324314112fd2a07. 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/QZ5FN1701515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadedf7af4a26944ba409d3ae6bd3d00e6a3562b604ed0cdb3e116a13baef1202. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLCK42212355.