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 0xbbd34e7dda1c44d374125e29fd9b9d0f340b9c737cebec5c72b55795b2fb8e8e. 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/e7217fd5-a759-4cc9-8b7f-31a06d2f8116.json and https://artists.proofprofile.net/proofs/artist/e7217fd5-a759-4cc9-8b7f-31a06d2f8116.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 0x597ba40c9f28b061fd228dc347115bf9f921a4ffef8f8642f74b41b9fcabcfda. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZFZ32339027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f967bc51ce55c03b01bc6005fc3a7ed12e659c65abbc98b741362f70a6b5b0e. 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/QZRP52310071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c03491b3b450066d44d8ad0a43414765f574e0aca3b391525e14494556abe20. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNWR2467561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420bb25f0c1ab512d8c1fe313092d2420b9e8567c70d0f80a123c6d091c3bd58. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZZ7R2499285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f8726b6e66c4c60ac637663ed2d80c2a7fde5feceb8b12be952e4d48effd8d. 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/QZDA42573310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9eb7db0993553e3a0242ddea56e10afe9a9469ea7230dcf256e53430c1c5d31. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6N2514392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d97864025337c1c3a8c75b6b878e5525227eb89bb16d3910abc7355ac734a9. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNWS2590374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a93d303c74f086c0f40f4e051752fa2484a87890b4408b580cca7a6fb5cb99f. 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/QZHN42514225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fb21ceaeeb6ebd0e54e3e2e3b1997a3cbc308480dbd23228d69032923a7cf5. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNWS2590375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15dbe0f6ecfe80b3ca36ed3705d3f35d2448020c3c2f9b5aaefabfef9b9b1c0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWS2590376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb681ddb459bbb84c96aca2a9dd6282397a8679d6db2f656b11ab1abf428209f6. 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/QZNWS2588265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506fd5d304059c89b254d99f80888801b5b3b29c3a95eafa5a302f16aa1e3a57. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWS2590377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e23ba43caeaf97e4931e09fd9b0ec7191b9be9b8312ea79b781609101201a74. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZNWS2590378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c80ecf2010294a028114d3e0bd6c95d53489d5f87c3d2733c9834fb7c4cd8d. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZNWS2590380.