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 0x7b438cc70939141a3963400f62d7326341f2fd5d4c3c001fe08df4415e0ec737. 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/5200ba2f-3f67-4c2b-b85d-0736ebd0fe71.json and https://artists.proofprofile.net/proofs/artist/5200ba2f-3f67-4c2b-b85d-0736ebd0fe71.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 0x0ad1c9669f8a816d9fa8b556c26655bea3e9cc46fff453690f67e5ffc974a5cf. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAFY2101739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b7dcb16f8834b73653decee82b7cf81829354a8823a390a8385b416260e0c4. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAFY2101742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3e747987a48fb14a186ff3ae4896e49eef2933c780df074177084c24a2a787. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/TCAFY2101744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7768a5c07fbcb41ca6eed3b7624d35b3b8886959680c42fb6d9db547f704bbc. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/TCAFY2101746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b4026e7708ab9bf4fb6c398d3dcd7ee8b08aa91672dc86e0fbe650aeb83671. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAFY2101762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c5e846835b2dbae578748b7b7e49c6836908547e4e5851eb3547d03d2540ff. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/TCAGF2216082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89c7a02a89ecdd703c9508429b6ed43f141eaaaab0f7784abd6edcd7ff517ca. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/TCAGF2216092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d8ace784f95377d372a16415155e0a4c8264865ce706520020c330200779f4. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/TCAGF2216098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51505e7bf6094d318e4504c5d5166e615f7ddac8bbdd93f9b3c4e5a7b7a393a. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAGQ2266831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178030f5cca88b7f6a9fe7ddda131178756b27297b5aba00ac763f69d5e8a31a. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/CHF032403084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f570ff3cfc7f0e9ca7d59bfe2f5cb30fb7796667be495ccdb6c38197ef25fba. 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/CHF032403689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b6be73c5f05210ea7c709ac963d628140434ee964adcfd9e175fc2749b81a8. 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/CHF032416225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27d010481261bca781bc09f79cedeb8a5e3fe9f026da764244912c28a5b6f02. 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/CHF032416565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961a83264eba918141bf6e4a39eec74fea9003951efb522af22055469c380131. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/CHF032418819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595ec35d326886316920e74f7a3ef9272f8002df22335e1462c237fb96ec3b67. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CHF032419027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173ae60daec240982742ce4c4d8c1c5b59c496d590dc1d6277af5f8ecfe1e244. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CHF032419029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75b94dbb0d17d81f8a9479ff281e28c2196c00e88dbc513d6151468896838b0. 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/CHF032419030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105e18c0112340a3daf0a2946ea759c6b796e6e3575cc47eab2c5294b07a6da2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CHF032507319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978290bc3ffc0e68bc7673bf7d966d8cff90836b9eb3b4a292edb20cedb600ce. 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/NL4NL2220705.