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 0x29c54d9a65a2ecf03838f0af3ec9aa733e9b7befdb84addd5a0a32857d22d23e. 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/9ff125ef-b7d1-44bb-bc5b-c7ea74afc986.json and https://artists.proofprofile.net/proofs/artist/9ff125ef-b7d1-44bb-bc5b-c7ea74afc986.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 0xe9d9538ad6b63565a27ea12ce63ac57cd1f78459c99dc5635a038374e2420155. 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/QZES91956939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c55adfe37ba395bb5803c9d0f202765f5746d44936ef8ceb015a3a0923d91ec. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZHNA1909886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d575bab0cb1a990334558a07cacc8512ca05195102a9de237e65d879e2cddb0. 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/QZHNA1909888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f281b05e791d86d18662b3887b966cad60657ab9af06471f0b8fe5b740c373. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZHNA1909890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20074070c65bfbb9c4b8b803f996b01430d53ccd7f5898e6d3ee3628ee5d808c. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZHN62117437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3840a31881e22c3378e1f94ce59164db1f10ebe1dd917f6fee1625af3905bb97. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/FIBAR2300535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63945850c35bf5083b6b52eb16cc5c41f96d06f342a975485ec9e0cd3df045e7. 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/FIBAR2300536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fefab3d27341c348b848be68840323286570a698a7b535ca29045f3300f2b08. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FIBAR2300435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efdedb0493e6b574931c8a725f3aaa1bbdbbb68b1f75f955624018b0bc1f8c6. 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/FIBAR2300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05083aa9d647fa0ea2d7b9b52f9248a4efa6dc43534f78ce43fa7f449898836. 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/FIBAR2300537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607ecf0620001ec4cb38b7ee4e5e0ddf3f8261251e90ba3c2faf17000165e83e. 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/FIBAR2200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596b60c0b6c0d383c9bb1d523535f9cd37629f27d925268bc1ec566b94968152. 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/FIBAR2200186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94aa4c11dce370b223d5e36dfaabf259aae1d67f9476dadc88d20fb84804512. 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/FIBAR2300538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6ad4ec01fee29c6a322393ba3c1eab69a289c5b77f96a87d9a45943ce402ff. 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/FIBAR2300539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c9b138a7bbc3eb35047a43f5f6d7ad71e1b7ed9a0ca4d174833aadcbae1b8a. 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/FIBAR2300540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d94ea9dc9e1841599b6007b0846c933a9cb564c1c29cfe21840dc75a354781. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FIBAR2300541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86609f9fe930827e3cb9c13f87743a7c574bb0208de29d20d74bfeb876558ba. 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/FIBAR2300542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1ba5deb93948fa7462c404d0e3a48eb52a6046965dedec8c783999163c70bc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FIBAR2300543.