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 0x3b99af613368c4b6d320d5349915ef18e489c6f88df28c21a31e362f64327a09. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f795fe52-595c-422b-9b56-1b63141bbfcb.json and https://artists.proofprofile.net/proofs/artist/f795fe52-595c-422b-9b56-1b63141bbfcb.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 0x1c233634cc05b5e0287b10c6a3b9a24f0595ae4c8aaddcc346f6865920d8931c. 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/FIUM71202922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc361eeead3a420774033543078f0d6576a63b9cfe5e2ea838564b525794f21. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FIUM71202938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4763b2bfbf6414a2029aa124ac6424980d2824fcbd77d138097af1bc0e2dfebf. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FIUM71202939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b15d8ba28358f4e14685687d32a5b2a257e7ad3331eb84aa1e39258fdef8b1. 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/FIUM71202941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12ccf54256c10e513309c7ecd5f1b4f22ddf11091249ea319b16e12a832415d. 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/FIUM71202942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9025a5e4ac27dd55531782899f5026ef7c20a8b46c3ae53dfa6ba303cb590692. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/FIUM71202943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60656d18978bc195132ff7c0ec099ea67a97c8e62de7d17097248773eaab57de. 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/FIUM71202944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc707ecfb879313a05ee32b5b202b632a458d74f4b22eb28bc506813039d9a6. 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/FIUM71202945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e26822a3b862bc4449dac23bd15781c0ff7f23093a69517060e18431920bd74. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FIUM71202946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5c9afc848965b64b68b9785ac1417784f93d29bdcc6a4e61dd86ce7a5238a8. 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/FIUM71202948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46788e15c5a5446ff763bd426e677664b1ed71aad9a12a026d90406755955a8b. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/FIUM71900525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e48c2eb889758d200803dda3394f1097ba8f826ed480e32b0a585f9172a67a. 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/FIUM71900530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfec5551d3ed885d29a250153e52069703a6c2d7f8e9323d5ad3690819804a91. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/FIUM71900531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbaf24e4aac475edaefa1b5ad39b2c7f3d9d7715c2fd31897ca49d6852c72e09. 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/FIUM71900532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ea03c42d2e871c1ec2a7f70f6a1ddf8ae278b463767c6fe7062a781f19be6a. 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/FIUM71900533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd10e068e160789b1beff9cc7108b7a0c968729385c4a1c8a20a276c140fb7d. 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/FIUM71900534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc0d1e74472ecf646e471369afd7221701fde7360ab023d85f55898d09c9759. 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/FIUM71900535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238525347c5fd64eb5ca97151f0dca26489b86f3ef51c67b223f3caa75d2dd61. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FIUM71900536.