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 0x398b0531f57a0a11bc07491a58b2fde65466dd45923ac2a814cbc780f3380681. 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/ad30bfae-b3ac-48a0-ac98-fcb8c3aaa01c.json and https://artists.proofprofile.net/proofs/artist/ad30bfae-b3ac-48a0-ac98-fcb8c3aaa01c.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 0x08dd4ee36b04e3033bb485a873739ad62c288049ecc9a9c7eae8cf03f11186e5. 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/USAT22305587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6694c6a4c924c00dbc2267e5970c1f5399a2655b8f6f915b98adfb94253c28. 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/USAT22307799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea878fefe8fc20ca619cd54f03c3e09aa6df92cc62cf33a680ffe0c4ff8e9394. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/USAT22310239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9d64f3a39ad9b80771695de773e3cf88dae8530db4664ff8f2c29897fc544e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/USAT22402234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffdf878e5d2f053079cc5967d15e171f2fd2cd2a27a46fd03f11c91bffcd8f0. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USAT22405576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b81a699558d0041b26f9f988251fd30782835bdc4f3fd159522a4c2f92149ec. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USAT22405575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffdf878e5d2f053079cc5967d15e171f2fd2cd2a27a46fd03f11c91bffcd8f0. Chain 2 (Bitcoin): anchored in block 957608 (2026-07-11T21:00:50Z), 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/USAT22405576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123349d3f93d4aba32a5810e69cd6f70ed620d7fbdccbc582477128860886998. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USAT22405577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9121af2df6d01bfe36e4fe593e5977a79105b5a23ce3e1b28ff5753874dd3dc0. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USAT22407504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea878fefe8fc20ca619cd54f03c3e09aa6df92cc62cf33a680ffe0c4ff8e9394. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USAT22310239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c90d5ebcc294fe1f43f3eece4dd383aa19a26b65c75ef8c86b1f0760fab62cb. 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/USAT22403709.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d29158c5afc51e21547d4c9ff1d8150419ac221f1125fb96b51b5cf3d76570. 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/USAT22401461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea878fefe8fc20ca619cd54f03c3e09aa6df92cc62cf33a680ffe0c4ff8e9394. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/USAT22310239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123349d3f93d4aba32a5810e69cd6f70ed620d7fbdccbc582477128860886998. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USAT22405577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670467bb21cd5bfb43dac64590bf247a67104da56c36e77c84896339352d4551. 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/USAT22405384.