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 0xce7e07a5e99d1b1cf90547d28500a24d0503adcc23fb9167f5b2b532003ba53d. 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/b97a541c-3c1d-42ea-acf8-9c2c2990e40a.json and https://artists.proofprofile.net/proofs/artist/b97a541c-3c1d-42ea-acf8-9c2c2990e40a.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 0xfb52da4ecc02afa68595f231b2fdeb34b0b5b64aa71e1edc71794ffa07fd8ad6. 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/TCAGY2311466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3eccd9c4792b98ee7f30dc8216b85fd3720415c07bd6f7aed4c2a3b79b4f38. 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/TCAGY2362301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc12e0e97955f018afb7541e6952c0a6b4b34fa57d4f5acda1185bdd8b730dbb. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZPEW2498135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71fc71af1b1fc418a718c633f9cd50cc67375de7f04fb8b05c50b151e42541ab. 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/QT2VB2428447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad451451bfe2eca1351c2aefda0ac2a882b2d041edb76dc2523a901412cf1931. 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/QT2VB2428448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42dd4905da56a3aa7bbb42c70fd4c0724ef1861cf48634c0f4d2aa2e178d589. 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/QT2VB2428449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f738b6d121fcecfcd237d32ef3ba619674f857cbdfc03e19f397ef1e0a18c72. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TLVEM2469690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc12e0e97955f018afb7541e6952c0a6b4b34fa57d4f5acda1185bdd8b730dbb. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZPEW2498135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3de111206a5e01ddf610d123c60fd76dc022f07c2d73e598c1543044db8c16e. 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/QZVEM1817567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09584202d671a9081ffd87c7b9a63dc8a9e1c0d34227db98241d9384885bd3de. 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/QZVEM2525505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57960e5171bfcc468187aceb18d28074f9db890628ef5ca285bd70dfa71ab37e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZVEM2537798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb718fb97e8a741b14b3fbc8d27f5d45ff1381335720ba580f632632fbf4234f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZVEM2537799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09584202d671a9081ffd87c7b9a63dc8a9e1c0d34227db98241d9384885bd3de. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZVEM2525505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2948dbc73d8e72a079fea8cbd0f4f6318ab8e52a5c41743a7d189f1addd303. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZVEM2537801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ac37be6015705325162bbb05ce3e0e60e77350b3438221bcec915c23f5aed9. 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/QT4K42505023.