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 0x2e6eb9a8052ed9a3f832f146228687cd22c3c07033519936d453e5c9b286b287. 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/51476ee2-df04-4725-b079-6df72d19f32a.json and https://artists.proofprofile.net/proofs/artist/51476ee2-df04-4725-b079-6df72d19f32a.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 0x22bc888061e11dfa7f220e2cf4a136305b412c195aba88e961329b0e3352a057. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HKG732324367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe406af658af385454880014df81f04525f3c2a3f20e079e0977d6edef2333df. 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/HKG732318952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fa38b5a356ecb95700a10757b78c24d2b04f5d1a5cae009152a444a436db6d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKG732318964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cf77d7fbda31e4ecf94c372183ad0939fa4a87462dcfb7ddd7e0e5d4e17d30. 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/HKG732306023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1636fc9806cafae617c647e9aa8ee97cd556d99d82765c7cf9279df6b31408c. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/HKG732299271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219c362a2eeb07daadaee4e72cadeac8d05a9a0325c79549f5271be9a99cd7f9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKG732299320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3c0ee0c7c7de2b4051d1d30477c54f53dead0f1ff13aca6776ff2234db2bbe. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKG732292119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bffd971379d9600c8e5c7a7d8dd59f57a33e8c26da9aebd74fc7601eafcd930. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKG732449342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d05e57669025079cc0437c53a521cef132476dfdf9ea3bab610ca645fa13cae. 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/CNZ852316400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8558e493447c57a1ba3234b382979dd0c89120d53f7ddda464b230fafcb1c1b1. 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/CNZ852307952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7a9f44e7089ff3ae5ddd03af4e8d3551052d15757505638fa2716222aca5c2. 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/CNZ852307359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdddf9089288346e53e3779963098fd52665429f29e9b780cd8a80872843a7691. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/CNZ852307112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3083ee59f6d9f7385c54425ab0c02a5d2d4c1662283bd889f4535e60ad8ca522. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/CNZ852306783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02dc6c367738346e7366481216d672288abc1829144e8224f99f319d45d089f1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKC371730027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9062b1c0d682872f6ace55011b4c3aa883c56750f67872fdb63d3161c933efc. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HKC371730028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5f1b25d1246fa3db595a458d48a3e57bcc0e4d5388f85a8346c9010cbb2f98. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CNZ852305787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbb37741813af86767fccc50c49f144e209e252970c4f8084e4609a3226bf78. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CNZ852305838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ead50a507787547177a7e6f7fec83cf2efe0b6b3286c869bfb7403bf6c6e57. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/CNZ852304144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae0123e7fc0840455c9a7228439060c49bf7428e4a9e05591729502fc357ba8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CNZ852304220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798a1dd67aebbeab6459a82676f5ac7dae5b17eccbb28ae968a6fc843fede3be. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CNZ852304221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bbda4e4e89108739b073753deab57d7151d3104bc6408a8af9f21ef63c3831. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/CNZ852303872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a94cac07271737e9d16fe916707c04c3498e54b3ef77a2bdeb7f2386f670a14. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CNZ852303827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e9a9f948f310cf8344d03dd0bdde8e89a2d56ae93eaa1ace642570ff5261ce. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/CNZ852303878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc01fa479ce8dc48fe89d32730ecde37ce86af46e2c86ba5d6cf5d9a9192e9e8. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKC371714995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635e197873cc4fc55e026a5829569b072a72d4efbf3af62c693d51241843957a. 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/HKG732288548.