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 0x3e90d1f10a25da99641fa245b5073c83fa8df4402ff8f74808869dc98c797ede. 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/da2dcc54-3d61-41bd-8e32-1e9e195c997c.json and https://artists.proofprofile.net/proofs/artist/da2dcc54-3d61-41bd-8e32-1e9e195c997c.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 0x8381ccf5a477a24f7b885ad459b77b1010c6164666b196b553caab15c872f7f8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAFC2088620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f95f185ef527e769b64e42f6b5a31499416f3ef5732f1b60940d3eae3b71d8a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFD2053542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb20ef9b3c0640de9f5457993ecd22172bf94dec66364e04d1c840e89c7e5c29. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:47:12Z), 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/TCAFL2128010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8d5ed06abf8e075a3bc4d6fc183dfa5e378c62f3d1180be2fdd1e58a777fca. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/TCAFP2107351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d6f4c6bf3ece0c3d3bcf3da4676af6ba072479ae0da3bd5edeb6561406417a. 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/TCAFT2134151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97baca5370de8fc510cbef93cb985e4ff6067479ab3876ccac20eac0742ca96. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:26:17Z), 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/TCAFT2134156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d35f3c69c8d2e00c7472b2ae091d76c181a3b59737e46262e939fb70d8f18f4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAFW2142703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b59fde1459c9fd2aa12162d0d2fdfac992d534e7d7f65d85ead683b73f93461. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAGD2265730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26eb90db78e98bcb9b37ba1497d3c3587c4a2d508db79969422f88c5f0bc5ab. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAGD2265749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4228c7b1954f9a1313519b67c61656155f3571910bc133da1a5c1f78ce603ec3. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TLREW2227722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905651be41f5631f6c907540d80cb4d1e3a538970438727b8966462cd4fb759f. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZVEM2368823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646db830f3d21c2bca8563b109eef2cfe79bc55ddf691498a85280b66dff3b14. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZVEM2374650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bdb26089ebfb3ad1cbcd6992dc11167d048ebc6bd5b1aee551108d215d69e1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TLVEM2462997.