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 0x950bdf1f3f303adc2311f081751acb495cfdbbbc2192a27fec6a4f9989ef1790. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd5b52b3-6958-4486-88d2-ccd4a936f606.json and https://artists.proofprofile.net/proofs/artist/bd5b52b3-6958-4486-88d2-ccd4a936f606.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 0x192f379d3d9c8f9d9c38936b47010ba3e261db617bb1db39456aa585c8c6348d. 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/DELJ81907364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b1a3443eefcdf6015e00ea56b8fea4262e229548cfee7d4f311a8ae8fd1812. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/DELJ81907367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52071dfd3fd188ab1d1d93426b33ed5f4e0e76d1c7af6da56de46c1857055e5. 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/DEOV42201235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe73dd56f273caf2194014e9bf554c338f1b7e4d98039aa182e4ce49ced3e04. 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/DEOV42201241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9aeea710e219080be9f5d178d7d5e1fda71b0af2d6116ae9fa079515d95f41. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEOV42201242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a85479c4c0ddbfc0ae95a20072db76fb9950013d28cb032b38524b2fb6a07b. 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/DEOV42201243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c62a2ced98670685dbc5a943c997f3635a6cc006b6883a04da967962e04c07. 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/DEOV42201244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891dc8bf72bd637de7b099fabc92787c0797c71cf235a260416df4db138bfb18. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEOV42201245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01062867de2e1435c657b95a9ba7cd5e692566da2d9963553074a758ee52bfb. 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/DEOV42201246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52071dfd3fd188ab1d1d93426b33ed5f4e0e76d1c7af6da56de46c1857055e5. 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/DEOV42201235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16f5c60fc8a6c27eb37b22d1c897a6036961a309ce7478aca580fb46dd588fe. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEOV42201247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaafd37d77c6b4a3a76d97356f9b21bfc98936ad8dd78ea1333034b4556a0b5e. 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/DEOV42201248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2dec57b202d951e0bd71b936e7c122d1395befd1ab812c9680f622d2becf28. 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/DEOV42201249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94d77ef9d82505ce46a581c9bd9bdfe7ab06971d834eec99492d25e8596b0f7. 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/DEOV42201250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181a23dd2294fafead758e78a4c8dce5e6c3b4678ecfad64bd09c443880f118a. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEOV42201251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84b1fa0e74afe7ee5f56800ff96511812f4c2d67d0457989f082d3bd6c5e2dd. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEOV42201252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84103726e2a2fd8da45c425be449823eeab2148c86016d621fa9468fe61415ef. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEOV42201253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93289fb8a2d6536f02cb2a6a07be925cc4f925c206fbc6306ed286af74632947. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEOV42201254.