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 0x08fdeaf36ca09a46895518cef197a075e61230d639ad04d8bf887c330402222b. 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/c8c7cd91-dc9a-4c44-abe4-e64053517a8c.json and https://artists.proofprofile.net/proofs/artist/c8c7cd91-dc9a-4c44-abe4-e64053517a8c.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 0xdc816019ee5640c7fd276ec3c7527374c6b33780fe72cf5e3a2194059d83e179. 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/DGA052307298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa7236e8d5a2ba524ba0499a0330bf34cb8d4fa6a7e3a55c5b07c542a6ecdb1. 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/FRX872313113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28df41eb2eee78d85ac968a05864a824bc4ccb984e1fe3b4712ddf33e081440. 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/DGA052307299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64be28d35578d9edc9c1988581c60869517612eddcb1d8090478a3c1fd38639d. 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/DGA052307300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2069386a19658c66cfa285556e4cac1ee7c1fd08be5c39d5fa3b9979be94248. 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/DGA052307301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x480da347a81ed5752ba7108c68368469d0761cc4efaa93cd9c01359c33f029f7. 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/DGA052307302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ae9f61830ad60df1b9587d1e88612a2e6cbd8a21de5e0f299fcdf04ccfc59f. 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/DGA052307303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd99d69ae0e66ede994c34fccc789d042883fb7ce73e96622f1e0e7c5dd93bbb. 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/DGA052307304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad6c98adec2b0c5787da8aa73ea4fbe7809c196d9ff4db649ec7a7a9359a5cb. 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/DGA052307305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa7236e8d5a2ba524ba0499a0330bf34cb8d4fa6a7e3a55c5b07c542a6ecdb1. 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/FRX872313113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bbdb083b24986f90de6fe7888be95bab285fee05c2b8aac9b1c2ac72325f70. 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/DGA062483592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353098669714f0700070f424e13ba222ec7c8e00802aa8b7a5277248d797a63d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR10S2375933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93e0208ae7274a6d23c326c2a7b8d4508bcbd551eb7373c5b86f287d7c6056c. 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/AUBEC2138205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1d94be5ecf1465d9bab3b14c5ed792ab15b1880cd8491469462b5a7ebfb512. 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/AUBEC2138206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549568f98b9e97803b85b7f2eb864c86612edb8c5ddc0db97ef55076a0feca02. 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/AUBEC2138207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397924c4a090c91aa6ca78653b5ee77d508a4d9a002bb42c7819fc385bc5fb73. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/AUBEC2138208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb3b6e49dacb64df8fffda9ac63c9fa8e3011482fcb2e6de49e059173cd610e. 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/AUBEC2138209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cca4d183780201b63ab5de25e8e10677e64771d5ddbea0374479524488941fa. 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/AUBEC2126396.