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 0x204bffb8eab85c7ce53fbe97519bc6928f31a677cb6ae6b0fa475608e5b60bf2. 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/f81d547a-9f61-451a-84f4-e0c004fd2e7c.json and https://artists.proofprofile.net/proofs/artist/f81d547a-9f61-451a-84f4-e0c004fd2e7c.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 0x567e4d60e508b64c78a212b3fdad04903e5bc1986942f3928f7e0c942a35a1dd. 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/CH7812361192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82af2f17021bd653d18346fa1ebb1c1609e87f4a79bcdbb35e0cb58acd8f8dcd. 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/GBKQU2273815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d09424edb65bd0520653968227b385c606ed1c4924884fdca1c54f06b9dc9df. 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/GB2LD2110240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8823080abc8289a9b6c585f513fb99d00667c7b5aa23687daebf18983650af19. 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/CH7812195861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba5e3d8ce15108ba39d9232d00cd1a31f680e2c1ccac125812bb2cf9b74796d. 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/GBSMU9017298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0653f15f0b49837a34b57110a01d79d9670f56eee3d2eb195a5739bfee7bb8. 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/GB2LD2010109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731d29dd4207cb00d82c13592014989b5d8e92fb5453652f4e671ea9f3e5f099. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T18:07:23Z), 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/NLRD52008106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea040ca7a23c1c36de9c5b441f1d447cf88187f90154d0686d89c007f714700. 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/GB2LD1900429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f18f0e99cf7a7913e502d01048048e4fc4412d72fe8a07f0315842d9aadb42. 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/GBKPL1970689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33fd0d01ce072bc1b9ad889ee52ff5ce9fac585867978cb78fd666e26b2bc8c. 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/GB2LD1900320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432510dad32c7a156e087a9b8567d7adf0bed08ecada290e12df4fde541ab97a. 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/GB2LD1900296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db25b7fc0fd33ca3514405fd80756af5cf941e3a57396ea4da753e5dbc6e145. 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/GB2LD1900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3a083e646d8943bc307f08fd858de4e90dd7fce58f274bc15d7adc0a59cf5b. 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/GB2LD1800807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c66d1a32832904fbf8470efc5fffc7ab4a1ab054e540a1eb5be5a13fa08ce7. 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/GB2LD1800733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813941fa66bbe5f8447ca94dbd671492e1866f924bc60e4e983f594b261d6515. 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/GB2LD1700426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212c0deff75b8c827e564f815978a38d61e3266152d4707f28e835d301cb4a9e. 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/GB2LD1700235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283d423882012fea1a511f53f297137db4089a9e3c4eebdaad4c7eadd22584e5. 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/GB2LD1700094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce05651b6e12919b63f93229c1e1caa28e1efa6106d1fdd19c25b1e7e536036. 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/GB2LD0902010.