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 0xf89c4e39bcf7b2637431df27998a135952d4c1a96e62f0f0d0093a483b1e4f4a. 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/4501ea8b-608c-4baa-a93b-0ce3aad6dde4.json and https://artists.proofprofile.net/proofs/artist/4501ea8b-608c-4baa-a93b-0ce3aad6dde4.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 0xda9d2631694dd58ba7796f8f43b84c60ffbd0a3d0214680b4a6163c2c815d301. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/USHM91889954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9fbfcdc138561c3c36155da318e193d9731c34ce2af9b1fe56977628d1565d. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/USHM91889955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230c51b70a27c48cb10f134e5b190ecc7f1ed18a7dd42aa3d23d44afebf55ac9. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:35:44Z), 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/USHM91889957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3a04802e42db3e627bd96b91a8657a2f28351015c609e626e7943883ef0b99. 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/AR0432000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db3e8f39312f99d6d178fc2b5efe91cd683490e26bb2c0fab3c35e4a9a6f7d1. 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/AR0432000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f010db45b1fe8485dccabca0571a26cf1fbc1315710aacb1c3052192350348. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:30:33Z), 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/AR0432000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bae1c2689d4bd6e25fffaec6d35d4fe15d46c4c5f4b909de3df17bf34720755. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/USL4R2134496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b2ebe5a0e07fc69338dcb543445f71b51fac9abfb0492535557a0a8cd282f1. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/MXUM72401574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f437dc51dcdb95fa1ed070ec4576f4d4f97d64afbe747fbfed9c810a2021a6. 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/MXUM72401573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c89dc6defabc1ff930fa4b5f698099b0b9de1174b8254c1216fd2b1f786929. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/MXUM72401579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70b1e6d42ee5805852618697dc01fbaeb0a28316d25b305d8ca353deb0d5728. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/MXUM72401580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5227e944ac4cd3aa0e74adcaafb8abc524ef9c8b76456d734b2dce82f0dc323. 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/MXUM72401582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1c89bdd100b89a66e19f7a5ec2e75ff809d87ac68a2a8e58f02abe9f3aa990. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T17:43:21Z), 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/MXUM72401576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f437dc51dcdb95fa1ed070ec4576f4d4f97d64afbe747fbfed9c810a2021a6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/MXUM72401573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3493289ccdcba84827dbf1f63b8b32b58426675a74797872febbccf68b464bf9. 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/MXUM72401578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48ab86c4501be4fc7ccb1769394eb02a9d12fec38aecafd1b2a36deb6a57f34. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/MXUM72401575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803c1349caceb389a4ae1cefbf4e7a589249d4e1376ff96d2edd736609136de8. 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/MXUM72401581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4a5621c0a42ed81bba47b270eadd51d5a9f8f746e37c63b2872c71d5d299c9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ARF102100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4a5621c0a42ed81bba47b270eadd51d5a9f8f746e37c63b2872c71d5d299c9. 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/ARF102100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a200798acfd81009188b4e0b893bc4e4a975bf7c1a7c75780e1d45ce4420833. 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/FRX202244123.