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 0x1000d0a02dbd711d5caa6abdf397887d9c4b51c0ba1819d174ea8c18a35dacc1. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de05f003-75e6-445c-9ab9-2cff0990332b.json and https://artists.proofprofile.net/proofs/artist/de05f003-75e6-445c-9ab9-2cff0990332b.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 0x0c0400535e216f3598f169e98804dc49ef6f63ccfc476ee8bd636320d68ccb6f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTBB2584844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd436869bda0b27e876892e2ae8f10825d75c154ec0dc97dc6ea68e6f38fe576. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZWFQ2518418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823dacf415e8c33f8bc0d5819a0097afb78c9d049940563d30ace500c6e2904f. 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/QZWFQ2520121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142c6a9f2e0124e30b98f5709c798fc2520c9d6cfd8ad567a0296deefaf33370. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFQ2520124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cce437a7f755d9e5d21d85f14991c812cdab6442c722020906b79009ee26f6c. 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/QZZ7L2511538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96eb2b210701528907fbb1dc0302afed5a4ee576c428339f9a20e6614aa24c74. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ7N2521130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd7df05773145950e423d308ffb0e6d61e01698f1023deb4e9904000256a4fc. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZZ7P2547266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ea9e3f4c85bd0e31509b4ef489566917fb8114a9a2bd9a611530db2383dc0c. 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/QZZ7P2550535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289b37944e34c8e516a522d14a77424c4616ac281bfc38939da4991bf64870e8. 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/QZZ7P2550515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cf2bcd2bac9e18ef6dc0a9f083830e88fa950458eb3bf6b8ffa933d68117b5. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZZ7V2567602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb254e615266fbc7d857c96882d70940c0a3b7ae84f2e3df26fa6ec775e3c6a01. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7V2567603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3c101984a5ee9022ee106f64bd01d28d4420739d5a4ed98055fa21f81a15ad. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7V2567604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31449470aa525765825909bbf2d46596b957b5d11f872a4f33064ce4af420bd3. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7V2567605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9645b8865a540924bd56979111d8c0271f07fb9dfa2c318712257a4bb9a4b5e3. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZZ7V2567606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e6a9976278d78c4867e61fb1d619263ada7495311c8bfe116880d5bb0c1aa8. 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/QZZ7V2567607.