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 0x4d0bdd0f13f714a9e8b37389e535e6c30d101c44cdae68d30974ef49a01825e1. 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/f9d98d38-b4b6-4d29-b36e-eae5846ce00a.json and https://artists.proofprofile.net/proofs/artist/f9d98d38-b4b6-4d29-b36e-eae5846ce00a.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 0x676382a2027a6ab62f4588cdda6b510b79caaae418f1a5fcca841bcf48635db4. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:43:53Z), 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/NL5MF2102478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3fb7c672007d1e7d15b920f2dfe06f826ba58c8fc543c37a3eac8be0e95daf. 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/NLAM42100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ffa328372ff4a164a1d7ac71aead4c52f1a1aadc5c25ef00fa31c3970a62a6b. 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/NLAM42000069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8751377ac2b09d0906d6275e446a3c1bb7ad9867cdc770c3f81863e811403e00. 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/NLAM42100169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bb037f316fd0fdfb15cdb55a2635bb8c8c8749280a5ad69f0c72f10063877a. 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/USA2P2311593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0610acf59e2e61db8fb43e010a2d39dbb480240162967cbedbe4cb96b8842681. 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/QZHN52282226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8e0de753763a3350ab4c4e8b081bae9e659fa21c5b4d75c19b7be2ad4912e8. 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/NLAM42200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93312ca6d648cdf27b42568b4c10ab13acc7588d9604d33b019e5af4b6b3834d. 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/NLB8R1900118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03d0ce4a85a9c3ba25c464dc835ca6b841f2a9e467436b3e2601c012ef939d8. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/CH7812102956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b5d165aa8b407bb672c492fadb83d4c3d340d4efb63fb1cbef9e047752bb9d. 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/QZK6H2429299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea15185430ed087ff6a9ec8396c502409d267d0cbda4730862f07324ac93ae9. 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/QZTAT2292815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7921f2b23d6807b975790930e07990c23a276bd79766cf9b9296c85054bac1f8. 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/NLRD52024498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ce6d2e9bac496723723518b19f83ece7e30ce0d2cac439c98b1256a4dacd7d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLRD52017943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d179ce42597020fb2b3169821d97186d544677b71526cdfbb9ec2ae3328a230. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:49:27Z), 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/NLRD52018940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c506daf2324446c7d644b6c843fb3dacba5489a54237cc6bc67027d3f8aefdb. 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/USL4Q2454783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e18493a05cb7ce0a9e025c6bf8d2560cc433d405ac884f86ef63403d7971af. 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/USA2P2241404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e60c277bebf044c5683d0f87bb2df669ee084805d48eeb7d6a525ee40309f1. 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/NLAM42200033.