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 0x2681985e04e85ff396becd19bf53be7e7dab10c1ab610b51decb4e3ac1f30851. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c18294b2-81a4-4399-8978-db2b45b9b852.json and https://artists.proofprofile.net/proofs/artist/c18294b2-81a4-4399-8978-db2b45b9b852.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 0x2f51ab3a61ba7eb7f0fef2a6adaa624a79489041f28a16e092b5e5bb10faffeb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZRP52116210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9671598cf1d1133d1f847254817842067b51938fecc211b41257ec537f34b7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZRP52116212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff67d13f9ff161bb9324b6fb283cf72211918ae690b1b9aaa115630b79152178. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZRP52116213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7f4a33dfd6a59128365421eb99b63ce94fbc115fe38b48a6b2cc66df3c8a72. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZRP52116214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d72a6bbe585a8d868d9b13218a058a78cab7d8ca9faef6103c9630ded45cf9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZRP52116215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7717974d9b404be3528aff7f2db402be867bf768031304a0d8998f1e1bd1e9d7. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZRP52116216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa582d8039aa24d4aaf7e74b371ed678a31b90586433fa928a641ea9da2dc952e. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZRP52116217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2c6e0aad12e5c5da8dc3cd8700de939980cde58358ed1dcd6fa002f4cfa1ac. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZNWR2418084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e504c73a94d723455adc54bbfa1b685caf4d65858d67c19505d40777cacee4. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZK6J2476721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d2c8b9b4300fd258636a7fc75838ccae8f40df6f7e53a253bb4c523abf3ad46. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMEP2276203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ab8f255c683cb44a1503f58cadebc26163212f35ebcb5a7d6d1bc14bf72902. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZMEP2279145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7be8d66687fdb9ac1804c6b8352189ce2907a0b335db498d68962b918a0c97. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZTAS2140790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6180a51f3f7e565179d60c2f4e1968da8a1aed30d4aa02977ec04e4a639e0aa5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAS2165177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e99e5ed33d76e9c6b4deee7545a1442c281b859643a4614a731f5dc2adde76. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTAS2179769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b169974fbde2882b76c948b1affaf5ca5484f6b5c91753d984085734446886. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/QZTAU2168558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00193b1773cbbe5eae8215fc26a41a25244a780fe5392b8b6d8b77e85ef9ee9. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZTAS2162186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b371a923c8f6290dd5a9528855cea6fa6eba80207ad294e4b70a8fbc3695b5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZK6N2275686.