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 0x2e76acbf052d036e60b763868bcf2e4ce1ae65688ced8fd4db027e84eddd72a1. 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/e1020774-bc4f-49ff-b2c6-9e20df384c7e.json and https://artists.proofprofile.net/proofs/artist/e1020774-bc4f-49ff-b2c6-9e20df384c7e.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 0xeedaea91935e8272a45eedf36e7472b211ba1ed445fcf0ce84ec240f457cdc81. 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/NLG620573783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0fa82994bb0c8134d79e28fd1f508cee1555a1900af07f604af96ba84f3860. 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/NLG620573784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a3be987a1378f9d285a07c288bd5925903fd4a02d286480c310be1ef877040. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLG620573785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205c018e4b5d05bc972d3b8624c73c40e070617dbd1c5e3a054d858010424fdd. 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/NLG620573786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f10c1464cabe7bf3d89d96ab3e70801b02b3ce31c4759d5982cba1142c7cc98. 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/NLG620573787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4fb3c53bc15cdd9272432ceca05365869a95ca2b2ebdcfd9bd9ee1f177a4c6. 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/NLG620573788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7706bcebc2712a6846aee967040f36f979a61ad69e376145315359f7008f0e02. 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/NLG620573789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13822972ef6979cae7e1b9367d3ddb596a167eec610ee655be6b090ddc8a23df. 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/NLG620573790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6772fc5cdd945bf08bc1f099dd7a208276a6578c641c7d29c1ca275901d2ea3. 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/NLG620573791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde320431ce0977ea62c052864f130d354388c6619786bb2ee552b097852842a7. 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/NLG620573792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8337fb9d78de684250099c6a630266e4f197f6561f800e35e697e16cc45220. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLG620573793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb316fcfec7d93b9e43326bf1d1163298352ab2eefffd6c0a8f30a2c0ee949a52. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG620573794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a70288cf4a77354d97879ffd0d4a0ae5883d76b7e8e22abd2fdee32ebdd09a. 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/NLG620573795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e001ee2e27716cc4d719bb75612c4dd6a7499a2282a0d31b034112a7760a71a. 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/NLG620573796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a9da9bf8c925d3205aad253854ba5cd1a6f5480d230f206598921962f1fef5. 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/NLG620573797.