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 0x39148e399e6a4805b0bdda0313bec54992e941e1e0ae3352b85ec07f7ad2d94e. 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/bc1c6266-af65-47a4-8256-b6a1973d1e02.json and https://artists.proofprofile.net/proofs/artist/bc1c6266-af65-47a4-8256-b6a1973d1e02.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 0x5ebb2ccff740310004a71f8174fe5e5c09a9e30f375d6a60f74010280fe46001. 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/NLRD51968887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9ed9e3ddd16a8ddd41e1cfea948da24eb7a495c5721394d532c9ea1bf80fd1. 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/NLRD51968888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d4e9ada636995473dba2c12e022b212b467b14ee5b8a69a905e3b819829b2b. 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/NLRD51968894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10b4fd9ed471e71461269eda9a400cf32a97235622e1bbb7045e8679dfcb60ee. 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/NLRD51968895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ad4ecd936b9fc9aebf0229339263dbde778b7390549596b3aee0b24e71de52. 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/NLRD51968896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9ed9e3ddd16a8ddd41e1cfea948da24eb7a495c5721394d532c9ea1bf80fd1. 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/NLRD51968888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02873a49151a62b88d68e33f3b25aa9a033387911d98eadfb11ebae3feeebb5c. 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/USA2P2333116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827e87c50a07a443e42299522ddc03ba8ebe7589b302a19e2dfc37132a0c5368. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USA2P2349409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee031dfe2141da7eac209918d2ded5d7017af8019c3a4834d7a2eb753d8192f9. 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/USA2P2349410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbcf2b8cdad26da893d3822c397e1641abac749fd96cfd90981d4493a73394c. 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/QMDA62497230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9ffe5395b27893eea6d763a500dd830655498502bfef6574dc6e79e03c66c2. 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/USUYG1529061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5093ee3a6ea34b930bf92da1de5536c38fa21ebbb7d8225feaf914c8ac818db8. 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/USUYG1518469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45d57c691ed8f53b63adc729813c1922e2b2765c8eaf6f7bb962106ab225776. 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/USUYG1446838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517dc52b9f0fa9ac147fed95fd95279537cbda2cb536032c6ceb829348ee5c91. 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/USUYG1446841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8ec64c8d2e83f5e810fe1b0a528bc34303d2b0465cd8451f58878c1173cc9a. 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/QZAM62100438.