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 0x0559760cb6943e2428d6a18a1256c00f457af3f186e7930ce7f9625352b6ab62. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c9fd59c-ee4e-4f7e-88a7-40eaa37d867f.json and https://artists.proofprofile.net/proofs/artist/0c9fd59c-ee4e-4f7e-88a7-40eaa37d867f.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 0x271447fe121f7bcb850029c73134ca4e3544a23cab5d38993c9e5f3f09bf4619. 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/FRR642101675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fd55b7a2244f668ca031e2b70321e06edc05d0ee779c2956c2cf3e3a6ec6e0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USLD91746942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be22256a043bf9d5a1404be089406581f9933b3768241dca307e44345c20834. 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/GBKCF2301121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7668ec62f19aa5c596a0a8c42a1c9769dfab363b8d02fe43c7c97467b25dc55. 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/USLD91738838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43e7e72a421ab3f3b6d4c36b9c9915e40088765219b76ab08b0a8e695d56f60. 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/USLD91737751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19394e45d2959c228c4ca8101e2760d26b80bb0847a87733926b9ab19b3622f7. 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/GBJAJ2102236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7741f98e5614db8184e98433ae05b578008035afbf9c61673df78fd990a1b159. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T16:35:29Z), 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/NLQ8D2100364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53d74c990d650ef94396a24c5741ab3bc5e6c040c7c0cb3d85c1e580d447e96. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FR59R2141353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbf1cbeadc9e324562c848e27ff204c2298a1ebfd86f1432fad6d8865432f37. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:31:42Z), 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/NLZ8W2100052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454cb235f8e661f7d11956be867206911f6b903bfec4cbcbbe2d19a31597362c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLZ8W2000064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f7365a4e8b8212f5d45a772926bf5523b0b7ef666bff99cf8d5604ecc287de. 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/GBSMU8003168.