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 0x0c2db0f1d4369592f1ebe0907f98c39e8c1deea16774be43a21c481b4880c245. 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/96b97205-c9d3-4436-b248-aba6574dea55.json and https://artists.proofprofile.net/proofs/artist/96b97205-c9d3-4436-b248-aba6574dea55.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 0x85e43bfe269890c4086e1fdf8e4ac59fe76c0e7739a5499671c8f3e0b3b3811b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USCGJ2352278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fca57086a6a51ba9c1798ebf0d5352569b13c967786ca28282bad54c5d9070b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/MXUM72300750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9994a689ea811b50ee9e261448adeb06bb92052ade763016f2a4c031778fa32. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/MXUM72301144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d27e50b8c9f0a2141337e4dd546b547c3151fd81ea56c4233972d2da01111c. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/MXUM72301683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f3384a6380fca1b2ca265fdc0d9ffc79ec21390848c2536efa41044e249806. 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/MXUM72301684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536f0bf398ab57c5aed7c3380999ddecb892aca07356b7477c2adca79825221b. 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/MXUM72301680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeaf751a6c1f2e9421c388e1714935441fde9a4cfae726420153fd76f13507a8. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/MXUM72301682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d27e50b8c9f0a2141337e4dd546b547c3151fd81ea56c4233972d2da01111c. 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/MXUM72301683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c5896bce9cbcbc8bfae21ede586d5802bef40ff277406f236b3b3cd2f12aa5. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/MXUM72301681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f3384a6380fca1b2ca265fdc0d9ffc79ec21390848c2536efa41044e249806. 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/MXUM72301684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cfad70c9b5c151386c3bd7655a91dc58746fbc627a7f62c05e19a421e1a9d9. 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/MXUM72301686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa203aa071fd1587850fbe758ac233ddb36bcdf8d1617ffffc8ded38bd6bc326f. 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/MXUM72301676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7af25f383690b9bff22bf848d661a75e2a218c50b3485321e6214673ba28807. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MXUM72403230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a77fadd7566a1dfeb97b845df2663bd3cc71d517042d0683cd7f6141731c591. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/MXUM72500589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebc4f375b37c7e6e0e38b46eff82771241ad4c9295121ad4a440d05a01b8d54. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/MXD782300157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c6533f066dc0bcdc67250eaf50e1845a336677b1fbc66013c2f86cc2018415. 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/SE5752467052.