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 0xf2cb389b3b008957c4334a49cd11845cc92c506e7013624edf6119d15e3a8e9d. 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/f4ce92e2-4bc5-447b-9e39-b31ab75afff0.json and https://artists.proofprofile.net/proofs/artist/f4ce92e2-4bc5-447b-9e39-b31ab75afff0.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 0xddae6891ef68be51e231667cfa284ca6f4e84bac7cca91de432d16ce2b7be473. 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/NL5UZ2407374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1d51a0f7b110c78b57db1acfee6db24f39bf4cbc7280511dd0fb95b2cf7717. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NL5UZ2407375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb96a075ca8d42b9bfee743fda7d69f8e47ba9c622e61cb9b7dc4a7a6093d53d. 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/NL5UZ2407382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64f316771ea58dd0ad80c12ec08e9e055c186d6c9456f7646df649e57132269. 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/NL5UZ2407383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddae6891ef68be51e231667cfa284ca6f4e84bac7cca91de432d16ce2b7be473. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/NL5UZ2407374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64f316771ea58dd0ad80c12ec08e9e055c186d6c9456f7646df649e57132269. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NL5UZ2407383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4acc2cd6d6ce45b873d60ada5d045961690f78a4adb49d0eb997bc1c56689f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/NL5UZ2407658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef758c6f3c94b93cecb06ccc0f5c39531b345b3a9f63c3f81478a1e0ba03946f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NL5UZ2407666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22015e72f0b38bb2e2a5cccb8b438b469db500e9f513e838c3cffbe65986a834. 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/NL5UZ2407667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4acc2cd6d6ce45b873d60ada5d045961690f78a4adb49d0eb997bc1c56689f. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/NL5UZ2407658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c0067c2b7305bec9e1551ecf855129c188a1419e3f68d5a9bff61aa2dadcf1. 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/NL5UZ2407660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b664dffa9cdc58c290387df6d5e40b5c29625d8c640532906532df90d931e4. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NL5UZ2407665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef758c6f3c94b93cecb06ccc0f5c39531b345b3a9f63c3f81478a1e0ba03946f. 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/NL5UZ2407666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22015e72f0b38bb2e2a5cccb8b438b469db500e9f513e838c3cffbe65986a834. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/NL5UZ2407667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aecc9f7025240d7078da6f0610c70c029bfd8fab6e29d3b5bf09ee138908a69. 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/NL5UZ2410406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f20589a84b183fcc7045d15eabcdda739c7766d456e6b5719e766f57892b1e0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7M2536071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42921768aa67a96576bce87726f344000ee3f5ad615d749b09dc826390fdfc62. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7M2591062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a976f1ad942d9a3b2e61aa87a45bfe089ecedaa28cf616623f9e32a3bd98743. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QT3F82537378.