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 0xe274d4f6b5947183c9eeb904ff3b5ebdb23f1fbe313537bf0b5ba5cca115640e. 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/d1837653-253c-4f53-a04a-8f094e42d16d.json and https://artists.proofprofile.net/proofs/artist/d1837653-253c-4f53-a04a-8f094e42d16d.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 0xc50fb464e958451b8ba5e92a9229a6b5434de8abf745a1f2697c7158c10907bd. 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/QZARB1853472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95897b700d1015d5e97cf927decdd397f29f9d7205ee0ea87e5bfc0de4d408ed. 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/QZARB1853475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff6d2f7d9843a1807547b099d02f77b563888ceb812b0d2b560dd0cc23d4846. 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/QM2PV1815816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f6bd2a8afba85936f81482cd9e1b9eb28cdb5bc9e1f6ee88cc557b0771b83f. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QM2PV1815818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a0314d6ef5b99c7f47e82d6d3fa4d4966f1ae36054fa9e1e83af76e6709883. 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/QZFYW1906102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6284d120fe817c2e216c54e0bcdc3b4e945077421641386024509a4d6f1a8a3. 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/QZFYW1906104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f5a049b56674e1c7f25ac811760bcd66c679ae4bc4dfe79a79a90f1c6325f1. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZFYW1906106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d22e0ec0153bb57f2b6c350d9cff954f3527c40677863ff930c2d1bd842d66. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZFYW1906107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ce1a92ca16061e2928f74f905da4fc03ad02a7b75b34b2ffd0adcc166a3837. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZFYW1906110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf71ef558f2ab9e712425e640bedf3275aabe575716c32770b499c29e4904b2. 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/QZK6H2000679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68facbd33cb0d69aef835c8c28cc8a71e06956a24fc18ef0b6161a94490382a6. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZK6H2000680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943400fa836af2bb6ff094c123eee91550627464308114b432925bc436f6544d. 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/QZK6H2000681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87f9bd275c50ea37c9de8a6e558714d016027fc19f9290ec56cfc2772635832. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6H2000685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46b17e9655de1f15611b810d12949f3fc823c05b80c8711c624356c4f6918a5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6H2000686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ddc20ea429f5afe1709ee439f65000c3a0241b7ffe4707f9b6fae7598242e0c. 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/QZTBA2317562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b316357ded9d26eed7138b306c7fac84a4d76166d5b2488e8e419ca6c99f293. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZHN72590637.