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 0xd9729f3b6db86d8ad47fa131485be916e686cad36097043f4a9488a08322394b. 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/011cf4d8-d011-4c8c-8893-6a5f901923c0.json and https://artists.proofprofile.net/proofs/artist/011cf4d8-d011-4c8c-8893-6a5f901923c0.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 0x3302e109fd436982ef63be39175b3a8e17aad31c1ba79882f930c16af52ef55c. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T10:02:12Z), 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/FR9W12129170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4f7a4251fcba2023f04920eb41f6bee5986004ea5f12aafeb73a25b4cf121c. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/FR9W12129172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc63688eda08e5fe4ce026335b0e18dcf0197c65dee0c7ba3b15cdff03aa6620. 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/FR9W12129175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b09cfa3f5c0f37fa32489035e37dca532e30283966b1a0afaa90099f49ec91. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRX202272785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44bf148e4fbd832e49c9806e69da9a53c2b04402ea0198ef247a07ef9cd9702a. 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/FRPZ92405550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb779813ed40188c41f43d7d2319cf9bc2012649deb71376a68bbf89a7d7c1cfe. 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/FRPZ92407950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44bf148e4fbd832e49c9806e69da9a53c2b04402ea0198ef247a07ef9cd9702a. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/FRPZ92405550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb779813ed40188c41f43d7d2319cf9bc2012649deb71376a68bbf89a7d7c1cfe. 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/FRPZ92407950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b9bf4fc83f1a5baee08db8fe8307567c65b93d31ee8338e6776ab34d99ad73. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T23:59:31Z), 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/FR9W12226886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51950af4c0fbb578361bed0ff0b5dba5a9ab62f24757808b370e2fb9d9a4a3a7. 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/FR9W12226888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a2146018acaa6c3d86be70446a5becdb4557adcbe7ab60140d789e23325142. 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/FRPZ92410720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650ec94f23f0c7d7e42a8685968912369fa6792e55933c09a1e0865a8d80645d. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/FRPZ92410710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea96183933dd057386235533b6ee26124cf4ebae1233169cfd26e987f8cc2e4. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/FR9W12215135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127f8caf59ea5d2f151da0e170e16a444482a55ee79918d084a311b7004f6b7a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FR9W12226902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5583401edcbbf29fe50a683af58ca65e5e86003c49aaa0089d3eb4fe3d6319fd. 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/FRPZ92502250.