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 0xa4031cd25e49497efa0cb302edeae514c0c64bbcfa3edf062a16576ca4972239. 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/8a9df62a-279e-4353-8d23-6afbb28f91a9.json and https://artists.proofprofile.net/proofs/artist/8a9df62a-279e-4353-8d23-6afbb28f91a9.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 0xf48e072022a13cc708a553a8c91aa2c12780bbe84812df082e5b61868bd2eec1. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/US3DF1519432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a77f3683ce2a8325509adbcbab904fa34542e5bb6117e1d3323b6454448777. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/US3DF1519437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e15545a8696eaf8e624f2978f88ff75d818f68b480e4f9f02fab6e40081b8a4. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/US3DF1519438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12bbc93419e053ad73fed9f369317d9cdc1a61bc2ff2e90356b23bba8b232cad. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/US3DF1519439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5152753ebc113841c32842ad2c9047e869d70d8be4ebfc1e239b145edc4a5f2. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/US3DF1519441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7443a1344a4b5c46ef96ff1510616cfaeaf616d2145653d1c4d690e9dfb08171. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/US3DF1519442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0fd8652af4894e7adfb6a71ab38ad41b29d81a5332b4a76e1f5ded67545d7f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM6P42088991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9eee4298cb2dbe2e2c2a50b643c1f22fb2e1ef0635be7a5819758748df9571d. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QM6P42088992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab05f8f67238e66e63481d8ab1246c4ba8e351f6c60c5f07d5b23e0777311ae. 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/QM6P42088997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e80f2c63b26570e9a98ad81df91b12c46bef46aea32043b7ee5844f3d81bae. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QM6MZ2036712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1b44c99b849ea0b0f29253a65e74ad213544ee800619fcdd9189ae5ef91fe2. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QM6MZ2036723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e617a46a87ee1cfc968c52eefc28884b05bd899ade6959eb8f92a7705563d73. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:29:44Z), 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/QM7282094720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf222dd3af2fe7bc11eddbec9d872672834d51a61be468b8e39995a41f2d1c139. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QM7282094721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8d6494bd365022b588f8a49e6b1e35b9378822183d0954590ad56b35b9d2e5. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:59:35Z), 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/QM7282094723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a82efda1416fb0b9f4d2fffba22794fc84b9c1c445574a2efc362754895afbc. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QM7282094724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370d41f569a52e3a8c26924124ff544bdd6373ef2bdb137a08c39bac8a93d9cd. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:35:30Z), 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/QM7282094725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca4984cfefca905cfcc1fa70ec07b9ac43bff51db1b8d974bf7dd634c6f489d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM7282094728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d742be49bc1e88071aecf05d8ac94d759ff989b8f9eb3dee870ec3c38db73e. 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/QM7282094731.