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 0x0cf4c08bdb3642b0eba59c90717d7d5a65d627cb19d93c1b932b4288f5de21ef. 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/89a1eff8-aaa7-4352-b53e-0d8e54e31cfd.json and https://artists.proofprofile.net/proofs/artist/89a1eff8-aaa7-4352-b53e-0d8e54e31cfd.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 0x53c4f357a960332c42d9b6cb5301dcd25f3639d2db26023d9fa9b36ae96fddc0. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZYFZ2512073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c6c565b66d3b666f948e854977883d8bcd5be4625a4aec3aa51171b4b243f4. 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/QZWDW2430895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8508761eda47e138cd6da56a7d19d74a4f8cf66eaf93affe872f04bf591b8622. 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/QZWDW2430897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2d7a5c2e1981c75d60197f6b3d7e918c234d96907f89214778e4c783cc38f0. 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/QZWDW2430902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5248a6fab42b659dc6b23651fc3979066882a8917e43bc7d78606273a181c902. 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/QZWDW2430903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ceeb2e5b6198c5433bb8248fd577af1f431cda536e3458cf96b5a824dcbbb7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZMEP2360304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb40c477b73948491284b379c47e7afc5dcce89df45f1eabaccd1b369e271afb. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/QZMEP2360307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922232389f41bee1a53f0f7f62f4f4983cb40fc41182cece2b0c0125d953931d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMEP2360308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116dc60854e47760f7f321dc2398b1c6ff581cfd16d4b42764ce106485cb37d6. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZMEP2360311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ed7c830133f07253ae104caca5287c4a662a57c245441d55b2d9af88138b7b. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ZBO4F2400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ed7c830133f07253ae104caca5287c4a662a57c245441d55b2d9af88138b7b. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ZBO4F2400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c6c565b66d3b666f948e854977883d8bcd5be4625a4aec3aa51171b4b243f4. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/QZWDW2430895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8508761eda47e138cd6da56a7d19d74a4f8cf66eaf93affe872f04bf591b8622. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZWDW2430897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2d7a5c2e1981c75d60197f6b3d7e918c234d96907f89214778e4c783cc38f0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWDW2430902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5248a6fab42b659dc6b23651fc3979066882a8917e43bc7d78606273a181c902. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWDW2430903.