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 0xa7dd666f419e46451a06a2abb57a91d74616c51c7030b1a60b11a94537a92407. 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/f306d065-049e-41c6-84e9-70552cdd0a51.json and https://artists.proofprofile.net/proofs/artist/f306d065-049e-41c6-84e9-70552cdd0a51.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 0x4b8a57b79c9268896562daf50aa42751059c4da4ecc8c4dec5b27b5f3f7c8381. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBB9V1000062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8670a54bd4f749060bf6f8931fa902b6e4d1892425fab6ef657dcc2a31d2843d. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GBB9V1200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5559db3a971c2fd80bde04803546c3567b25197f8c0e87582a81031c3279f4c2. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/GBB9V1200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815a8ce06c51c24806eb35907692441dcddfc8768974d53486ce37a4fe96d65a. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/GBB9V1200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaece9a89ca1b01dd3a3540ff12506a56d88c9d80ea666a5898fad33eee790df. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USA2B1600251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858ce748f58324362fdbe7288b806a24fd97e782d6be3bc7c11e8b9bc3fe348f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA2B1600252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fa4d7327ea0c110205edadee8d576868705b0248d44c0239cf05c92cdf63e5. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/USA2B1600255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a83c8358b11b24b774f8f1c69e6216836d2194d1b8caf1e27e19814199d837a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USA2B1800289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa98133875bda1fff02adf1537e3ccde02a2c185c4fb7b0b44c233063376bde. 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/USA2B1800290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81b280252f0b1457b7735165f19b40385c08b510e22668b963d85abd223493f. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USA2B1800293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e642447c851f49e599ad159d47d812ed4155089d73108a5a375340309c0414e. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/GX53U2588757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92b274ade0a4f7a0477cdf58cb26109cbbcfaaddd9cc1e72fb86da858c92955. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GX53U2588755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf951fb442b044160b1d8d2181ff33a8f0b02c50e0daf4109cc64e84f51ca3d0. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/GBMA22515215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f28be5c0c376f9787f46dc3769e151bafc65362e281311bab40e09027956581. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/GX53U2588756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e642447c851f49e599ad159d47d812ed4155089d73108a5a375340309c0414e. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/GX53U2588757.