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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fef2de0611879e9161f3c3f4030cdbaf5d43d5708ab2a30dabaf5051ef4c6b. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e46e4783-0a8e-45ce-9642-5d51185ac443.json and https://artists.proofprofile.net/proofs/artist/e46e4783-0a8e-45ce-9642-5d51185ac443.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a8cac3152b8d2dceb38a862f7a9cd435a4f18b29fee791bf04498e62b23018. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/NLCK41053751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa0723958356a1b3cf87bb6b0a3ae313f8993e06e24ce6df01be657639a62e4. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/NLCK41058037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c52c3a1d4de79c860216759f90e0c8707239e10028d5995c58e3f6e3b1fea0. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T18:29:36Z), 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/QZHNA1922022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe970a3c7083152cd237a2e11c66ef07e5ea31d6f7f7a906bfba4ab29725b0ce2. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:27:56Z), 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/QZFZ42031793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0730eee0ba67ea46a1bc8ab06f2dedae96f28cb8a8754df1dbe429a186d8814. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZES52020505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcb8eb3031c0c9cd48f8fb4259cb661b07425b0ee1489881f8cd4a7a32497aa. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-17T02:04:50Z), 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/QZHN82024745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4996d96dcb3518c2ebba1a0c7c41186aac0f4687ca4afe99fedb608bdcac7f2d. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-17T00:12:52Z), 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/QZDA42280966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d5d3506f0be3fd1829f2d5eb0666dfc39acd24a0a36f35ddec481c09543e60. 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/QZTB82292128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3883f9afdccde8cd73ae3e3da573c19673471fb44abf7bde58af69c562299626. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/QZTAZ2323747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71d2e1be65106b106fb20d849f488855db9a4b974a607460e262825e59081a5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ7M2461419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d42e46ea2769b0e39d43928cdc3c43cc1ba834135e2c15c548512a5d5d5ce9. 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/QZES82568643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8821ac22816b1a7dc3b107e39a85afba5e4d620d8c0bc2ab4e62aec9ec7bb3. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-21T20:41:46Z), 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/QZK6G2216611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7799510b67ddcdffee8bd90f9282a9a95aa5f565e9e077202401e68eed94bf. 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/QZNWZ2461942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457b52812175a6350de0ad89c81393cc4be73dbfcb7b8507bced68ad371a09b1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES82236478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95d1d2e7df56de40d9d6b374c990aade500acb2855e7056f747e02686a0a6d6. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/PLF241602556.
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