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 0xc6ee2e24073c22ea7349885617c33ea14c6f121288fe4c397f3b3e4f024de21d. 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/6ead5168-aed1-42d0-b55d-bb675134b0a7.json and https://artists.proofprofile.net/proofs/artist/6ead5168-aed1-42d0-b55d-bb675134b0a7.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 0x8e8ffac59980304c873a45689e26b4d0759f4f35b0fbcfcc6d7ab78b8c1b8b60. 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/QZFZ22129576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8226b8223df5833d1436bc2b760ed99f4a5737c9bb57bf2137f10be5e898e171. 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/QZFZ22129582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbc7cea95ad0984556cf217123c8cea2d31d7480c96947d93af46c9b57d185c. 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/QZFZ62572825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5025a09154698395f1ab764c9cf978b4032d7657ab992ff8bc197c51a3bd9214. 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/QZNWQ2452617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514cd3fc23bbe3d83fd52486cec589a8cf654c12734c5e6a513c3f6eb0e8d3da. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:02:42Z), 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/QZK6H2469380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa958a171ee4dd6c7fc5bb1816e7ffbcc0c50e908a19b8663329dd01543d7956. 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/QZES82481752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6045eccc43d39eb4f7cdf4e46460a5cf79252b9e7e677451d6b05f48993a602. 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/QZTB32396796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838d703a07180a5b5c756e11c177daaeb24fbc5410e154952d5e3963478b0440. 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/QZFZ42461610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda656a5594e25834bfde77602e3927c9f010baf661a3f1b995ad57f579a98b56. 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/QZFYY2472950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad2b49df35c23522aa4308ba621071b290871999d87c5527790fcea3af515f2. 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/QZNWU2320769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc031a33f37ad898116a4778b06473fa14d9ab2d8386ceb91df7e75a90cd3a640. 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/QZNWQ2388056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9f007f00fa07c612641eefc4ba978b14ab0ef58fab4070a9adb34cbe3d73fb. 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/QZMEM2368143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b895427864e593c301cf2a117b4ddc6a4ab6e46a4bfde9fba1376e12ec2d575. 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/QZNWS2293646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409761d1887a4f6b2530b5c3f2dcca79609279c12ffe1273d5523ecb4c3c7e7d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:58:44Z), 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/QZDA42230449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1b593a9b4dc2188961ed736e6beec9d4b86691c2ee385d4f92fd7d23c244f6. 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/QZFZ32118449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ad877ab438b701b68bba2f81e64a74b6ae334306b443d4cf93b4a667a2db97. 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/QZNWU2326418.