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 0x8f113390719bd992674d319fed06e2f7589bb8bb17c74a30ae94ede888bf1f0a. 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/2618b9e8-bd99-4337-8ee2-b45bca136fcf.json and https://artists.proofprofile.net/proofs/artist/2618b9e8-bd99-4337-8ee2-b45bca136fcf.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 0x940142fcbb3d78a1b97737c206a5814e9248720ee5b22ee6ca6be500d6fdd519. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN91941183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62347c8e9e20f1a20518fe63373fb06a98f57e88a7644f755af96fdbda85b27. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM8DG1808119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b55392fd2bdc2cd00379cdae83f473421142fa7a917bb6d07faa206c53e1524. 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/QZHN62056994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f2ad92f08bcad405735bb49ec52aa17f5886fd2f9db0fb8e8276774fda556e. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZHN91941184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d70f3abcfef3a8acbac16f5bedfee0fcdcf0d05b6face02f11074251b7d1b7. 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/QM8DG1808111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa15255299305bfdb53138e26af7afaf71b1f857f9c22e56680750c04863bde1. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM8DG1808109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc178da142837dbdc8ef744a39b3e6606deb9e17f617fb1ea4a130997e3695f72. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/UST8K1756779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c22ebad96ee4df8120d424391f82add215c16b464d289f2b2246d868a9093d. 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/UST8K1772919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4ee8517e2519f1d36eff6afc3a4025e54dd241dfeccc26b0bab9e870a63647. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/UST8K1786640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc7e28af271f36c7661daa84b21f059a831d322f214452fc0efd70c9fff0bb0. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZB4J1820577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe539b7d85f5a65ad38dc4d90bf2a67880282b44d1c2dd62d9477085b397d60ab. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZB4J1852620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6c58d0c6b8ebca3f3456bfc1200d8e57d4366006924942a18133557e0e5b29. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZDA41820493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd555283df851418db39dd588abf8609b54db09384ff75a076f84ab37f62fa82a. 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/QZ4JJ1988805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ce3e7272d32ce67febeb87481036c83266b2ed3508636a58386d37154a6949. 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/QZ8LD1918859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ecf895b99854732cf48291f0f861058e92276ceccbbf13403799a34e754d3a. 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/QM24S1902083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbc1fd9ecf246e1a9b4f30a65b580bffd63e531207944d3ace94660f281b0ce. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZK6N1942251.