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 0x144bf303c02957a1cd7fac49a47663a7dfa649dde560c271aca68c0cd11af79a. 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/41c56f31-0171-475a-bbd5-a95ed2be9374.json and https://artists.proofprofile.net/proofs/artist/41c56f31-0171-475a-bbd5-a95ed2be9374.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 0x6952ae87d94fb2a4077d5959303c1af021d7759ab6801d8df9ef6c13fdd7d66f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NLH2L1700320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9ba93e56be1bab37cbf56450fa29e84754d6abad7c5548d32df35ced2185ac. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLS761900563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c1fba2ce42cdd53d2c49f018d43ce7cd1e6ac13fd10505570d85316871ea9f. 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/NLS761900707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5c824a77de22a94c951b18dd494cf607a64a6e52d6a90774eb479ac3663af2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLS762000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf3e73485631f7b794a6cac6c49a6120475ad74f5ddc83312797d614be889df. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLS762000265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840e345cfe669f256ddf047db4847c974dfed3aa3e07a348978d806190023298. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLS762000379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74107617f92a0411feac69be222e5b4b7e3c37ebf5146498f1166705f8e21d2. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/NLS762200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d61601a49629047a5064aa6915b6a06331088d088ad89d09f7de85c583e618f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NLS762100573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5a27db1f3c97108781d4b05dd0103702f50b85f5fd65f7290b24a0c45eb8eb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLS762300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7877497e98b54e96e41df8cf4c1076d15c62e6c9320f43e8d7f5843c74a9c2f6. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZRP42407857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c0faeb07258fc04e2c338a762e25b5094380fb9af9530bbf11987302fc9a73. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZPLR2435897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb3c0ec2257c012fb476e86572b95a95e5b58e04f4fadab63ee57e3313a4045. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZPLR2451992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3464ab5fdf084ea51d66efece446de8365498d85b6b1cb4cb5b343d3c15566c. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZTB82437964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d54b8de47d53a72835573d6303ce7cfa0a6acf94b5d0d2d9b7afd948d3da16d. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZTB72563560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc8c1a4de0fc54fd44cfe412c1e6b67ca5608734c0405d0a799f710f460f5f6. 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/GBKQU2445108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09770aeeaefe425bf6a91ee379b56d44476d123e0a160d5c821282160373f6ab. 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/NLS761900018.