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 0xc1b97bf7684c502b33a4de1b9168cd0dfee980b97ae932fe32aabd66cfda6436. 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/be02755d-5c52-4b3c-a6fb-a3d411801134.json and https://artists.proofprofile.net/proofs/artist/be02755d-5c52-4b3c-a6fb-a3d411801134.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 0xe888251217d88c7a45dedcb14d8de4662d8af5daeb216d35f8498a85d5e9bd9a. 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/GBKQU2517864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf583a2653ccf43a7a98f9d3c2eb7fc1903fd6a8de0daaa1dcd76f1ab36ad6c73. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBKQU2491713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155f902db5c6723317514668b25240df9f27a19aa57e07cd8cecca0d8a4a075b. 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/GBKQU2456995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac2b648337b82476021654716d808a7516b9f3831ca229dc1ee87cb4fa45ec6. 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/GBKQU2426843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2560d4e76185fe667954357572efa4140191018a629155f4671591295bd1759. 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/GBKQU2399472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872fed8eeeacb0c8e36af855781630a158e5843ff2209b546036ff4dad93df64. 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/GBKQU2399473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc439970d830d6cdaa8a2b02856727d1941c259fbd3c7e6d8eae37626fa9808. 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/DEH742306243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb3b18fabd1f7afed28b96e0ca90cf0756ab2e4a8ec678bee6e36f045e79a42. 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/DEH742306244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f1007976f0d4f434d82a67c45a85c80d9ec7e946ec4310e09c353aeeb98293. 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/GBKQU2299210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c5aa5b566a091fda93ddcc04d33d75fdc46c1126bbcd820ea08f250ba7596a. 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/GBKQU2299197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b56b887847a3a65df292a5b799ca0b08ee598e3bedbf2aa0cbf068c62a359f4. 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/GBKQU2223688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3083257ec4ebeaf34d94666c90e4751d5688e983f2d02f5c2a09c77bee6d28. 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/GBKQU2204226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd81f3884fd5b861bfa684241c74c712827ef47ac8ca2841cc78963cb61fc35. 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/GBKQU2204227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85413ae1e8082c5fc8365d628b36b4cf43ff409ebc71203806b1c55f88dbfb4. 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/GBKQU2178217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b910f240a3ab4f3ca43f2c819461011f13b3b217a37153a68fa7b3a33e0622. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBKQU2178218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9228c8ca06bb6ce296385385fb373143dbfe2c159e68e08dcc3ba22cf1c9f6. 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/GBLV62021961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2536562b152c555cad0b213311a96960ddda24b2be8dddc7f6e1244f1954851c. 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/GBKQU2076517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c91915861c492f28f493cd2b343e40d81730a8018a96e027e9cc09a21f55b8f. 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/GBLV61719854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07dc361f0f4e50020311a63cd0af4894c4160db4af840a4f476b23175b8e97b8. 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/GBKQU1890812.