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 0x326539bf17110f937a36f7f76f6df2a17bc40a009613300f474014ee7e73a455. 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/41fa211e-007a-41c1-bb14-8423909e31dc.json and https://artists.proofprofile.net/proofs/artist/41fa211e-007a-41c1-bb14-8423909e31dc.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 0x32bcfc9b1ac0e41503041f36ac9e73e5e1b15547e894a87b812375f869cffc27. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/DEH741919110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b88ed9c8a313c2b5b451e846048c8acc67244c1143496abb011664fe0063b4. 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/DEH741919112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ae04fd674ca0d595bc5fae346a8f8bf9e42ef611e0d544451f368669ca85fe. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US83Z1932353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840f5dcce5637de9a56c01d197a698168e5eaa71e5411fe216f8ecf213156e5e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US83Z1932354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74909afeed82ae612a8a5f92cc5e8284cf536f3fa098bc877b6a5a565d1c0f2b. 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/US83Z1932356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02194a512b7154a2e1c5e5f2cb1b28ef77407bf89b958506b979f92c5ccb2dc. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/US83Z2017014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a477ae47ac75d66db4c2a91a97fd8abc1815e4c61b19e42345a085e1ff1bed. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US83Z2121507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4d30ef8f93f4aa08477976fbc557c0d74d613a93b164586f696926da77714f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US83Z2121508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f33cb92a06366b7d35f9ad5d291b235841e7fdb38d5b815e50a0735b4970b49. 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/US83Z2204952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b1e1a8297008dbf1fca1cbe20f217511f8611f613035dca309ebb7cf1e05fa. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/US83Z2204954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172e566cb2ce8efa7017fe79ce53e46cc34b2f65165406495ef385bad237339e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEU672201352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d44d8dd60d3d7ab3d2b3f0540e000a62b991e645c6bfa9e26867564720a76b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEXO32235924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878ea5471fb96531cad6dd7ad0899b92aa78190d06f0bdd52b64e51e6e03784b. 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/US83Z2329867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffdc8adbbcece208e0d18ce9aa2d569fe7d51a6300e7c9b154134d23df3e7e15. 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/US83Z2476228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a66efa8911d561917de6e50d4e8814b5733b198a43084099cd6f60ed2a6d30b. 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/US83Z2401129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8294f193744df3cdeee41091e95c907c3eafd01e8d4c707d5f6305a4de029a94. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/US83Z2419215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55b8a0e04429a39dac5aef1116bbf2c0d0c63d5dce3956c249557de3ddae405. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/US83Z2424694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8294f193744df3cdeee41091e95c907c3eafd01e8d4c707d5f6305a4de029a94. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US83Z2419215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b828f97a19c8ea5b31541433f1d8c4e2f360d400bc853e15a066dc58a1e4b33. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US83Z2424691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcf5f29c1442cca1420a089e6ccca6caed7dc3fe40dad03de65e43262890f1e. 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/US83Z2424697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc602a21afcf0e910acc71489f8811afaf6de49fffcabbe10bb433b4013aeb47. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:08:28Z), 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/US83Z2424693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58718f94aacd1318e21979dd152f6b9fdd4c733e316f94747bb01eb5983904d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:03:37Z), 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/US83Z2424698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6e8c7e81de1d736b07fdc2e9808f851c48797d4c77ad8ebecc61b2563261b7. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/US83Z2424695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5a0b8df83cdef1ee4be22b6312b31258f01f84cab23204b761c28ee781a31d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/US83Z2546473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0424fe4ac06650d11c14e1da1d301a5376deb8c3c8ec19d62ba1b08091406899. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US83Z2038439.