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 0x576ac16fdbf9fa85121415f7295f969a1f83f57fa3080981c67f8475ef300b96. 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/acd3efb8-f3f1-4fd2-85b6-a06ea719b9ba.json and https://artists.proofprofile.net/proofs/artist/acd3efb8-f3f1-4fd2-85b6-a06ea719b9ba.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 0x0a7469cee9901f81366e652141e1bec00d388260d4bcc2b073cb8dc58f30349a. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TCAFK2134039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c5c12cdc6bb45533962e341bb9ab3fb6919a0dfa34cfda7824755a27c627c2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T02:11:58Z), 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/TCAFK2134041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3465ac73119b192e3ced5e8b998d2d1b0e3525baebc573fa2a6e2aca0bc72d2a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAFK2134043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef45c74070eabbce1a3b9eb14745b2a601484a8858c4682ccef31b2ca30ca16. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/TCAFK2134050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b1ec701c6b66117a13bf81d2e4ab81247e42b0f6244e92d76cc150686a149f. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/TCAFK2134068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e14a0062515a36facc24292c2bf62cc94994c8a4c0bceff1ed5da990e54ee3. 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/TCAFK2134073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc90fb47d13cd305cfc714ec63095f982279f36b0f745d1affb66b588268412. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCAFK2134082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d036607286c3747436304d9e10293b997f048ad4e78d2a9def595e1957024a. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/TCAFK2134084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e304a4e74663c4d6144354ca78f45c6f0f89a4935ab57c4076b9c48f364a89. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/TCAFK2134086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb2cba6489d6aee87d4b79309ddd049d07fe54cc4e910d0df9cf0373039762d. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZW9L2458025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a686361643133ba033d9dc68f81af8953c28d37bf0959aaeb215e3ea32740fe. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:44:41Z), 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/QZW9L2457730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f5be1c70c51e88962b0e0b8068e8eab5e943e00fcd027f3b3b6d7279cb2185. 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/QZGLS2597233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f206b50fec272bdd53bda50f8feecb10ec5af76c0f0ff4dbf8447b8872108f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZGLS2597238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d91dd22b870bcc7d388486407c9fc3d12b410599891580b66c0ce99a766029. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZNJW2518743.