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 0x50553e7b0f466d0c397f272f1f4d6589da8c7edb40bbb4b17c8a11102577f6cb. 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/ef55a9b4-e47a-4347-b7f6-a323d3188ca6.json and https://artists.proofprofile.net/proofs/artist/ef55a9b4-e47a-4347-b7f6-a323d3188ca6.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 0x759af972e2b6f9e335053da0dd7dccfe819ad647917fe0c4922c9a7bb15ad4c6. 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/ES71G2132434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12181f27555a9104214745b6c3d33a554eb48fe26e27dd35263a5e54d768ccb9. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:38:55Z), 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/ES71G2132435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa134f68d4df45dd56ff3fbb31e29b72d91ca230a32f72fd5ac36de90e01dfc79. 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/ES71G2310451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5ccd018c100c2f46571c5e0aafdfe0cade7dd0906804b146a131ad92fb7cb8. 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/ES71G2304055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e2070b3e516089915c324220f25f465b0f91fcd9558fc228e79de75945b88c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES71G2143990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2434134da279e2610fa940a4eca1af4280f5520f79a4ba8c45f4afdefdab489. 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/ES71G2045927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca102c10f5100cd19246f38b7f30f86a6ed624bf9b90601615660fcc81bd7e7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ES71G2003599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6465fbc16897a62bce10175cf8f61f1d2928e262d02da7c843a5c25659b3c436. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G1914879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e463ea299f0dd06bdfd864064b5c10f0aa656b6cdf78ad3bcf245fd6c782da8. 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/ES71G1903472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b883353482f25a7082f134d0fa9d88612c3e4b422ee6472ed955514b4f803a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ES71G1879225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x288048f7c4b16a249742488256ff0de1cc026309e48cdbb6146774cb2979c365. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:52:11Z), 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/ES71G1864673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f54b5ec95d74fb536b5c296324e2b8f175599bcc245a0af82c69ea6c300349. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:27:48Z), 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/ES71G1864677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bb58d7ac7787596094fe72748d97e37fb862383c54e1f9ebf2bb4cc05007ff. 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/ES71G1864678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336a5c1511906964547a13b39780db3430c3a427da67dfc7958e99d61c0e8636. 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/QMDA71842232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea739f192fb79193c8750d03b06a459b79be307c45c20f1cc3e90728664ef8e5. 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/QMBZ91730537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fe5b5acb04eeb821d5f3094b3b3bcfb6c6aaed6fd8285ae4db68a1a1420d97. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ES71G1707273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1cfbdd154b7add7be21f2c9e01224aedeaa6dc1ca6a1117844472bb8a6f067. 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/GBSMU4143430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4cc147125177aba5c2d8873dc00e31de2b305aadb3a35ea6f810d75c768768. 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/ES71G2400370.