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 0x5672c146b40d1e17046410182150f56a411059309666f6c1407a8cbea095c176. 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/21399696-801f-4054-ad94-a789cc4022c7.json and https://artists.proofprofile.net/proofs/artist/21399696-801f-4054-ad94-a789cc4022c7.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 0x28d54dd89af38e340a5f3db0f68ae32a07d0abe8655a770b4be36bfa8d3ccff9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMEM2019275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0cbfe039dceea2a3842351161103fa7031c22e4bc4ab7adc2947b1e184ddd64. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZMEM2019278.
Birth of a Hero, Joy and Sorrow of the World
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e18e326e79e06e41245ab787c3b7b57dff697dc40e0844fa4c13407a29548bf. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZNWQ2075981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfe7b4eeb5eccaeaeae212b7412e3131f076f51251212ba4d588eda2a09d04f. 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/QZES52107987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0184cc5c66597d369c1e40829290f7dc60a417e4fd0458f1e48f62f3062572a7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6K2109949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3483e07398551c5cd12125282c15db663b9bdc749f455c73ff2992cdd2b2329. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZK6J2195085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae49c9035441239e8452cfae4aa46daaaa72e4e791208edd1aee387bea7aaa1c. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZFYZ2213573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99c0e92df5f74dd0a55bf436d0c4e231e366f8254a991f540b9389551d38e3a. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/US3DF2238679.
Somewhere between the clouds and the mountains
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20cbe8c609644ff5f61f47b1a01d61a9d68f0804418f8a1efe0d542592e0d26. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USANG2225595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454a6d9a3e24a730382f0a10bb410fd87b6eff6bf9b3787a9c309f6b1a47cf37. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZHN92327674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427602dcddc71c14629931e4c7032d2393554e206df0b872942b41893ef53bbd. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/US3DF2529046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15778af9ef757432f24976fb4c72c4bfcd825e616240e60bee464b3e2b47ec8. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZK6G2559015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74353638a298a51e24dc3111f8cc6b149aef58f65d92eba6a996f8634dfce2a5. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT3EX2568563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8e9f38fc306ace1940f4e56b920484d92814326ec125261d6295a9f4377d23. 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/US3DF2436458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33485503c6c127c90863bdcf2552dff3668e50241f8df314a4d81abacc9bd92c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USANG2494094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0404a5545ada9cb577d254afe9560e3497ad686855ff5dcb40ad7637cc51755. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USANG2494096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb8a4e06ba4c1e03fc83eb022d88b8126d586b4063eb5acb34844c8eab0e092. 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/USANG2494097.