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 0x3633e5bb6f4c7489d3a185cf2c1ea6209dc5a8ab0547677416521a9d9660287d. 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/35ddd1c3-32f3-4ad4-99ae-b77fdb690884.json and https://artists.proofprofile.net/proofs/artist/35ddd1c3-32f3-4ad4-99ae-b77fdb690884.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 0x8f49ea03006481cfbed4b5c241af623cd04d9fe2901b6757544bd9604ba060f9. 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/USEL48791901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb9b8c90a743f9f9907d982ea390ac6a1c2574fbacaf9566f1de773db8a82df. 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/USEL49192012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be22f332a5d2264cb40672302781818197a25b65efdc9fdde0826141180863c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USEL49392109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7322d970ad58c2c7d7c8d5cc96a958ecc65b645f8bb622e87d28aa1762c84b. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USEL49392110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3bb615d33a7aab6cad2bae1c4fcd46c077be89d9ffa95d54287727d4a03401. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USEL49692201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07b05fa8547952beffe3cbf9267a2f2bff400bd7021964a6f4eca50b77a61cc. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USEL49692202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a58d01e1ca1b73ce9c0fee9ceb7a24b22896cc8c68399c0559f7b2603ea1ff8. 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/USEL49692208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5401c39c64299c23b565ca3b916d6c52ddfa869d1cfe09a4fd5ebede2260e95d. 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/USEL49692209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe07703c4a441b5e599d99b61c9dc71cff3b4c948c287935b64eb50b98fdc99f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USEL49692210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b4c6dcfdef1096aae8518a3893597e9f8c9c6ae9588fb0e9bc25c967de57cf. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USEL40192507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09dc304b15cc1fc27f310774878273f52ba786d6fe7739ba318a3a69856d7f0. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USEL40192509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb616bd0787f46ddd0237008c854b0216e5d374c6909bbc8926d279cd68793427. 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/USSAR0625703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c3f0d8cfe318b0aff7611131695b917aecdc485c4e91e6961322f781bbf516. 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/USEL41292603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329530da07757bc79fdc05d490d7fabaf5e66f237297168fd4a320e2d75e1ce0. 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/USEL41292610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedee48361cdbf66b26b92dd9372e4643edeca39e2bad2bd9cdbdf418a186eb4e. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/USEL41292613.