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 0x3bd9dec27fb43142a284a5b870e540bf8531c766f15be346a53c61d02d5487f2. 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/02c89f26-c660-4e85-9629-e7e26e2d88ce.json and https://artists.proofprofile.net/proofs/artist/02c89f26-c660-4e85-9629-e7e26e2d88ce.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 0xa6c2359f35c7750370ffb43371cb0addc42c72b4a4f68bdb5c18eb984fdde7a6. 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/QZES91910497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cc6af8c76a7ce77c5bbb7a275c83f951a7468cd8c7b77c306a7980cc66ab32. 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/QZES91910498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358e8c9ec3b40bc11890a4f34944304fcdb98f9f89b601824d81b18ff4fafb3f. 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/QZHN81918621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd14868e662a237ef4df8e9d4dbf3760f7c4892ddfbee55cf6333d1c582851d0. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHN91968512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f1c8157afb56eb5cab79170e2261a75497fc5f71fcb612cf684af2006c6779. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:47:42Z), 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/QZFYY2087159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce41379db9b935ce2d9103d7591f95afe2831c7d887a53f54b29758b813cd760. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA82103894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee56b4aeff667cf54399b1a1f72cfc65301a5a0cf160effa2894cd7321a1cec. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHN42102681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6462b13c6c013e794b39521a112045d558e2bb22487d964ab32ba05bf55f28b4. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZGLM2371929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938ddaa0e42da5093672dbdf38c7cc157a50b75aa9f007795a8cbe173f69695c. 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/QZNJX2468776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97be78907efbc2034f235b18d3bec98379d4c3a9577a228775dcb4ad172215d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T08:33:58Z), 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/QZGLS2557575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ec82e286f2dbc6920c65dda522798a05a233f691e58959ea35b691ce6709c3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZMZ92559122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2215cb10a5b412f9f28b41543d1441696b423a13320b7f99c9927853c864285. 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/QZNJW2544343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3cd1e53b933a5938164e16e9367b836c16144fd8211c083d9727e79a30272a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR9Z61800066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c063544f2c8a9e643358daf316e25e0aecc1c74ac2ed7f0f5ab4cabdfc9ba4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF2271491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425443fc0d33b9e9d7ca4a85cdc360b971f3c7fba924572b2f11cb045de2cbc9. 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/USL4Q2158985.