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 0xa1eb9ee90d067ace8d3a4ed6742eeb1490079241a57af217f7030787862ea01a. 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/1c33d9d4-51cf-4d67-9fda-2b1a18405b7d.json and https://artists.proofprofile.net/proofs/artist/1c33d9d4-51cf-4d67-9fda-2b1a18405b7d.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 0x4a658dbf2b18dc9d29b8ce2d36a5bc0354083a6f06703e767bf4fbc4a728d102. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/BX9ZT2300081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14068e6fe9eef2b58051133c4575c98249c9b63647571ab2778feb9379fef33. 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/BX9ZT2300271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2829462b643d1e6053ff5cd83fcf10abebf35a739ed6126e7f6049076e80391b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BX9ZT2300384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd515ead4f5d6ed1651ff3f8ee01e75244b22c419e2ee47b838e2e6538b07f05a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/BX9ZT2300388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca60ed01950a27aee28193612941006cb8ce30b3d6dc553618dc95197b0f1a5c. 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/BX9ZT2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc986e63d8ff2dd1b5d3db131edce338235b2700725d3182c12e65d0b7e5ba3c. 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/BX9ZT2400710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2562aec6623f71c61331188d140b92ac16924e9fc70a1c8773480a0c6a1214a6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BCCWF2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef00ca725b6fae7f685fa58981513c481aa912bfab23805763fe056ad2450ab. 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/BRKUY2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d074cda5839fc934ca9f2c98b911e7315379c112c0c3fac58811458647587a. 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/BRKUY2500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902f16b326f1f85be44f35e83632ca8d1e03917a6c7c8f77097063ee2fb1ec39. 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/BRKUY2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed0c5ea37362a68450c9f807b5f4c93210bde50fc8d68da317dd46a7822c45c. 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/BRKUY2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1f72f184f33834ceb17237537f79bdb668b7f9664c2b3d7ebfc99c53dbd529. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/BKSAI2300094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294ee3eb6c71ead6f938a09f8452ce6c39ad9f99e83c88a608e495fcdb1ba326. 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/BX9ZT2400245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8719b6b2607024fecdf02c5a2ada2f4de4d56a5b8da1a45d4b49310dd66f8f. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/BKGNR2300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53a70e3abc13db6a988cd7052e19b4170baaa8a67d1a711ff90d58e0cdbbc61. 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/BXKG22500419.