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 0x06cc0f0935dd7202a88825d156011dceeeeafadbc3951f79d1c31410a930e5f4. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e144ff98-08a2-4ba4-8b30-d8841098891d.json and https://artists.proofprofile.net/proofs/artist/e144ff98-08a2-4ba4-8b30-d8841098891d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x628c51d8a81647307841a266907aea1778217f0be55795069722455eb843a2a0. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZRP52399980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9b78caf58cac57f9d79df40de50b11545ec77cad61d5f40f1a7687f2f034cc. 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/QZRP52399981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc394a1fd2a6d6913c6ae0c9153363063de62ef6def56d9db57c52fe275937c. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZRP52399982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251701c662db8e369f9b03979ce3b39ee31ed00832cd817ea4f7d1b8e4c3f363. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/QZRP52399983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9adeb7076cb5c14ef21b4810fef408aaad090a40653faa3826e5fc9b77b7049. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZRP52399984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841416ff4708027a8da0f63373b8a25f5e44a0da0dde6789924075a657b9c2e6. 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/QZRP52399987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3702fdd91878b7f968a7617a2bbd5ffc81075a42405049feca469503105b94e4. 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/QZRP52399988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849f938317f25ba8e34538d4d70baccbd82618272a8a4b7f90bda3e27124e9fe. 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/QZRP52399989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cd3edc8c8a4a60ff121d0f9c956816e11fda2172b68276ce342a804f3ff5d6. 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/QZTAS2300813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de721dd9ea6c3993cabee8df32ee7de731ba4e40b8b268e6e9b94bf7f22627b. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZTAS2300814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1fb2076a9c44d48e9106981cab6e25b5c4dc19fa72a4f2b3c338b96c40e902. 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/QZTAS2300815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6514cebd678615ab27f0ef3bd48fd4b8fe3aa45cc3e338b7dc6d4c4b913bceee. 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/QZTAS2300817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dc9bfc4d213772b07b28134db47400d8301ddf203d4f453402f8c4700446d7. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTAS2300820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00689b6714acf1354daa4f77b05a8a201f3fd6b08514867a5e19247160262c1. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZTAS2300821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35df6fb105d4732e8bd5cdff24cbce46243330e920a7e02131481e68b7299c22. 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/QZTAS2300822.