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 0xdec385f6c62af1c5b147b2725c1f87ee0575f04c2ff8a5bbb8a0a9080f29f49d. 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/6548c2c9-dc25-46e8-93c4-33fadaf8036f.json and https://artists.proofprofile.net/proofs/artist/6548c2c9-dc25-46e8-93c4-33fadaf8036f.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 0xf59e7609482f4aa2142abc97daea2b2ac0ad4ae38c30557934db622c7c2157fb. 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/HKG732330008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de8db395e26a3b157a25ab774aa81ff8b30553548e03532ecaf83b97519ddb7. 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/HKG732319672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a811948373843482eead1e7e032e10895d24f6e0e0c1a7ad1ed080a239de3e. 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/HKG732332670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a513bddc2e67a69031f38ed329c9130ed7d005459426f8c125a6b0ac73e0f8a. 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/HKG732319529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dc0b98f60a8d11f75e704cbef0b5bfe4e208b006ffbe936907785ee3789c6d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKG732319530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ad3a0c84f5a059d7dd179821470d5f7e0e1629b211380ffc59188afa5897a6. 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/HKG732311820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7a8cd4c568ded61d73117525c18ad6d9569046bbd8a3867ce84bab8fa9b7de. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/HKG732311821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808a470161c8d94e0d716c6b0eb44349817442228e52af6dbdcb623f31988a9b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HKG732292636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d668e86e65bec63c825ee298676f1147ccfe18ced9fe8f28cf3c2001b83fb2. 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/HKG732277087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e74ea370db1a662ebea5a3e4ee4dbcdc4237346240bbeef6088efb4b467afe. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/HKG732277088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc57226a19bee33b625a2aa472ccc1a3adfdb3bff8a688564db948d81cbd897d. 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/HKG732277089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06bf0598852a8df7d8a106357be7200d699e151ab76d9a5ab96bbed16e0f6f3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG732277090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dcdeab51578ae0fdb10d3676edeec66ca52124f9eb944b41ace68910e2f6b8. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/HKG732277091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2162cb7e86e64b26b333adea8afee47974a44defeb1b6e1763207cd3f9ebaf. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKG732269388.