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 0xe3f02d1e92cc9a29f03c6cbdc440784b69cc6e5a214a69152995c6bfca7328c9. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/68be1622-7f68-4f09-9c31-e9ae2312ed56.json and https://artists.proofprofile.net/proofs/artist/68be1622-7f68-4f09-9c31-e9ae2312ed56.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 0x16a07a933070a8c9fb97951b8d43fdfa30656b663707f6ab86f37a34d95c78bd. 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/QZK6Q2490532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d863f28dcaf29682e43f75affa506de944722fe78bf9e5ce8815e625b39c29. 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/QZK6G2490816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4efefa51024c2ce46a65df14b2f4c9c7d6a6afed31be004c26dd4f04cf63d4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6G2490823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02a69aea2d10e3bb10a9d14ceac7de7a5f4c59b37007cb51e9d8b03f9527b89. 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/QZRP52419866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ea598e84caac6a44f3368443a672a80f18a73e3d5fe18f618739c4f3345ed2. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZRP52419867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe686112343fb88e9c04a60d3accb4455eb37b0f043de919f0fb9a4616d3e0591. 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/QZRP52419868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5de8a2ec24edd628f014ecca41d4fc8f4e0bd0cdf95d52e566ccf521bf9597. 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/QZRP52419869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ab5f23b3bae26f8cde17c23410e21f0b9d5bb90a1518ff7ad9c7d3156e2158. 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/QZRP52419870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35fd36ffcbbecbfd564638860054d2ca31ada8f7cf75f99160650d51b4a61b8. 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/QZRP52419871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9322db9b978cfa7ae89a5b4e8c73b42d34c71876e00667b292790b46184a613. 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/QZRP52419872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae8060a8372d55a4422c79c13dfd4cdde10ef122d102b8fa60e2e811f01b36f. 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/QZRP52419873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb829dad05c76abda59f42dc2bca4329d9fb99e2841f1a43b7e93bdb3a89dbbbf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZRP52419874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87782452d54d1bdec62edf164d93eb4c1a4f917d3851428849c8f4320dbd1e5. 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/QZRP52419875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775f7cf4c9a251103f29cc38e9d35ce7c7ba5d9ba252eb8e1f750e95d6e39bfd. 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/QZRP52419876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674bb2f549cb835be84278087d8c6b9a6edb7967237dc1b1e5d80574e55e984a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNB2568568.