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 0x91a2de2a84be8a7a0595d6d817696cf560d028878d1e43f3d53a0f2c342294d7. 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/70919272-4563-412f-9cd0-b563733ef229.json and https://artists.proofprofile.net/proofs/artist/70919272-4563-412f-9cd0-b563733ef229.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 0x528c1b178c069738282cbde4d818ef24a9df3d1a81645b5a30de8efebfdd4680. Chain 2 (Bitcoin): anchored in block 957522 (2026-07-11T04:46:56Z), 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/QZS632130321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b7a2419de435c0754652f4e05a3543197aa383725f5a62378dcab59f8aa00b. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZS672155645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad4a4dcdc210ec4f00b5655297043e39fdc99113c754e4d32dba1a3a74c2200. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZS662185866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc7816851ae3751ec1b9938bf21f780132c202de09aa1fb9081f63dcb106fda. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZS632140366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5764b2c0af8c8de03b06eec12c8002d9080dcd3be93d1b1b3b0b738ee5cc2180. 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/QZS662128597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd921d72f7f789676590d6b49aca657a122fea92955155ec63dc7b07ad8bcc64. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZS642106777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f4b13cf4d8f181570516bc16dc6b1c0d66ba3b088ba87a28d112cc7f5e8649. 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/QZS632192351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad4a4dcdc210ec4f00b5655297043e39fdc99113c754e4d32dba1a3a74c2200. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZS662185866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064734999faf93062078f1e751c6ee668075ff5b72a2dbd4b5b163e992491a27. 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/QZS642108026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123b7bdf299bd5e9c5b01c2693e043468f29be552d36827d1af9aef44b26ef14. 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/QZTH82105014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485bb6197089dde5ee0b36cf8a036855b320062d7582624866b2692784f2521a. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZS672188987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0136705ef33002e62c35546da1138af0399e856648d074c325e5050afee77f63. 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/QZTH82105016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb10b3c6d34809fc8c80a261f9b48f69785ec43319aebdb5562b78d434d41bf9. 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/QZNRS2182307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb5deaba88a4ebe1ebe8f46a126699495232e586a5cc47bf6627e8b7403fdce. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZS642134647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe496c138f1da2c965fde360812fd6ed0cd7e6092c398c80fb2e55194a6c88dfd. 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/QZTH82112130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee3c1d7f1d57f24c65e28f8ced57f0117addcac60ee31683b502326ebd69e95. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QM42K2287872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d92e28cd73ee50495928f4769081ef5c6b7d990f3c01a1f05a59951d5b717d6. 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/QZS632282734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc712821738a14f0854505f5ef21330cdf9ff88f13e31865c5eec1855bbb45a. 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/GBKQU2436599.