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 0xc37df032f95ac1f72ec736ebe11a07ed93b6b238f661b980b7a375ff8ca11225. Chain 2 (Bitcoin): anchored in block 953681 (2026-06-14T19:31:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/64ebf368-934d-40fd-ba4c-4da83a67252d.json and https://artists.proofprofile.net/proofs/artist/64ebf368-934d-40fd-ba4c-4da83a67252d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
New Indie Folk; February 2022 (Indie Folk Central)
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 0xe6ace98c15a911b4ff94dc9527742d6855ea0376bd06cd747f2cb544c5822324. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QZFZ52083265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b11076832b6caa08c9af20838dbe62f9d191c64f85c806af3d491b7f75ed54. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZRP42147952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc399bd9798a63662986b5149549c5243d83a2844e64e991b8024bcb95ec9f747. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWV32452919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd9e657af79195b090b7c9822cf760bb636a4b37e3585eb8895605c5a05ae0c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDE2429294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ea501d0236ba0918d83cccce70ded727bfe0ba18727adecaa833a1eccb3bd4. 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/QZTV32406556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d0cc41836ec393c965bdc585eb476bb400f120924e9acfbf07ffac41fd8af1. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZRP52358168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c0772d7dff4ffe5bd8ee56f58abedc745fc8e521219ff89d6629668c1349f8. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QZMEN2010027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ace98c15a911b4ff94dc9527742d6855ea0376bd06cd747f2cb544c5822324. 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/QZFZ52083265.
Indie Folk Central: October 2024 (Autumn)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe436d53b5efe7e6995ddb8b4a57684c35a80a146c51992994014700a81a8fdc5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZMEQ2444227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4f340b567f054493cf5279be219ef5f0bc9b8e419d66d2fcd44089f153deaf. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US6YA2413333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f06647b22f0fc5a9b6f9576d971e41cd804b56a6c00698c3de145bd54fd7bb6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTAW2463587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a71f267fe81bb7aa68cc996bad1f1d1cd2484d9fcf03fb47d6431edc92b804. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZTB82416103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31fc4a0cd2518f8b710980260a9772e365378d646d36ed692c7f29253cd4266. 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/QZTB82447299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa024d3af77b2a75e9555c42067945d163c4af169583dc680c03eadfd53e2a9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTB32471817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc399bd9798a63662986b5149549c5243d83a2844e64e991b8024bcb95ec9f747. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZWV32452919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9274d3af75f385882e58e03eb142313da387d6d08b25dc4bfd0cecca7a25d5ac. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTVM2457944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13376d8c1e5c06992bcfa820f7e1df2420c5349b1f68c27de618bdf507311a4. 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/QZTAX2444795.