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 0xd6606818577c046cdd9ddc0b2a9d8ef359e1fcbe9b33cff542fabc4f60e288b3. 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/c45cbe6f-8dc1-4efb-88aa-0ba7f6a7a83a.json and https://artists.proofprofile.net/proofs/artist/c45cbe6f-8dc1-4efb-88aa-0ba7f6a7a83a.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 0xf7ead48daaea8f91a5ca6a613da9933d63af3e34bd0d390da46f1966014ab817. 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/TWEG11800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50dd4b9f60727ecbcd89e20e84e9abdf0456173468b68e6f87abcb7753c41fa4. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/TWEG11800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a91421f3fb354743d22b77ac8f19e343a5c4f34edc7087464c9c7af3111659b. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TWEG11800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80150330a371f0eaa0e29b3b472035dc891658b535432b4c34fb6ba74f34f362. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TWCR72100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc032e538e617ff3a7ff43c33f73f26d008f4604e5e03b3540fdb6d9fdcacb5c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TWCR72100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ca83c69e7948041de2d2317bcc01e281bbd732d5d8004419d80a02f37bdaed. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TWCR72100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8475c216d035bf321238b67ad3a439a9274c2fe4efd285db0d4b7b79a1ef86b. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TWCR72100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737eb2d8fb445ab3439a867616b7dc22a14a9a1a5126d93ac4c5c30c5188627c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TWCR72100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4bc31a7651c51e7cee8d1db88cf0551c4c391c3074d894c339477e9ffc008c. 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/TWCR72220002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d5b6ff3596af2bc96d3b9956a4dc5641732422007d2dbf33f13cc38d102eab. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TWCR72310001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502de9c4816549b1b811297f5025e0dfe2d9c300d3db3aed4d7b4bc34b3aecee. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/TWCR72310005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81ed8d5d4a512e5898c0a61e33579df8b1f197ee4c68565e071e18b4d2e1d1e. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/TWCR72310008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6e07c636dff95c110b5f3bd6830d3b87b332d28209f3ceb73fc16290697be4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TWUM71900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce32d2a28fd4daecfe6b168e52bb081b4abe9bfa6b69a80a8b22529ef5e0524. 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/TWCC32120962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6e07c636dff95c110b5f3bd6830d3b87b332d28209f3ceb73fc16290697be4. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/TWUM71900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd823cf1670592446070c2d7aabda36ff28fc6bfb8a5d554ac91b327c2c03029d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TWQ751800011.