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 0x9925241b146da82d6377c2c25a00261cc514bf090f8ae51c1db19fb09b5f7f04. 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/c5d69dd8-96a7-4c1d-a7e7-6a7ec1492303.json and https://artists.proofprofile.net/proofs/artist/c5d69dd8-96a7-4c1d-a7e7-6a7ec1492303.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 0xbd9c487fec90f7918eb9001b200b7413d3406b9c8b9a6ff5ded8c9f458005640. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/TCAFZ2259168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac8b8a231ece8467e1c353b453a63ffe086a0e90a1e148359c1e18ee342e43d. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/TCAFZ2259181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8531faa289649ded8f1ee5e2bca79a4bb0ec620503491239adb6a9144a99a029. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAFZ2259234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9749e2b3b12db19739e86411c1b2736fbfbb3293d197155b5edd2b8632027b5. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/TCAFZ2259243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af20a91839f683946949fe39bb48e91b6ab5f94c625d83414e7f9e2a21bc31d. 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/TCAFZ2259313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0728d6133fe608dd3872c4d8160627ddba2499214e462c8afd90833bf6ac3846. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCAFZ2259328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e26a6149a06b879c112ffc7e3b3510a5e03f6cb2320fe32f893a4e2914d5e2. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/TCAGG2249539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce56c1ee54a323784bc961f880662340a6600f782c5cb58c61986af62fadf958. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAGI2281716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c3aa11777f914807027418e8620b8ee3d53a0a2244e9bbe9c23a8f339bde82. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/TCAGZ2355116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5768ca43b5e22ad61f1d55a9ebf655ddfeec0439f9467bc63d238187b45db470. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZWFQ2341446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2c3e5c84c04bbc7a717c4d79b5abe6dc72fd7cc9843e7f0b02ae0a1d937712. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTB72427706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680a8c3da7114a9855cdb77ec49aefd04d639cd9f13de0ef2febc150901881ac. 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/QT3EZ2488409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab33a61d1123c2c3b49e731a16e04fd212ebbb67e8f94b3175326bd2cb57824d. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QZNWT2551933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7db08fef6b2c40a9234a7af584cf70460e2b3bbcf65628ca51d70b877ca52f0. 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/QZZ772556214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f12e8c22f8407e205e3ff984517a5760a62b4b0fbfda5adbd25175f4d84a84. 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/QZZ7M2506551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f49ac57987ddf3ae267f24b704b30f0cbb75272ba0d454aff33dfa0d541375. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT3FB2571349.