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 0xb7f114d03f67e68ecc1ffdb0757405e1ad79d103e91c3eba0fd928f8a2ed58a5. 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/f12ecd0f-c6d8-447a-847b-4341dc8906e1.json and https://artists.proofprofile.net/proofs/artist/f12ecd0f-c6d8-447a-847b-4341dc8906e1.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 0x6d9d316e45c209c3ab1dd1cf403eba813220dc9aa0e9f419efe1f2043019d93d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ES6102122501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7715db548b682a56f825fdffa6c67a62ca6a56fa407c0938603a4c9a187ea86d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/ES6102122503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f2176050cfe75ec01b8606ba8d851215cc0bc112c8a72ef337fc05bf2bc281. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES6102225203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c585ea162a330b15193095794369d329e98191e5e5e49aa4da2fe56558e90ca. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T16:07:22Z), 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/ES6102225205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db923c9c60254a599f7ca43ee3cfd764b8d0095bee726900f4e164e322ce733. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ES6102225206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8173665c8e000edac85dd3345ee9a7952dd77a9df33e71c8101d75bdbb0367c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:55:45Z), 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/ES5062304701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a235fcd63a8914b3374d9a251b239ed0bb9cded20ef51f048c6489a06145df. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES5062410201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4241abc5ee32d21a95b1ccce8673d17d1915b0968a4c05b2cfdeb67da9f9af48. 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/ES5062411401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefda79ed049ac25a5928942a2c26a2f4201e11583bbe08888974c4fe0368a595. 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/ES5062408701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5c4f00457c8b070a0bc1e1956d0ef27ac30552316649d872f67895d7b91684. 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/ES5062411402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866ad854b9c01bfab19e6ed1d94e10805557b91e043fff3f3e5690742aec3672. 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/ES5062411403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f654c4d5a237d75d42d9d308cab713c08de992c06592c00de7c1007f8519414. 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/ES5062411404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a235fcd63a8914b3374d9a251b239ed0bb9cded20ef51f048c6489a06145df. 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/ES5062410201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25158728f16f6c5b8028b2e470b04cb7e9519be031e9c6dcc73fffe11bb5d9df. 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/ES5062411405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca13e6e282fdaa244e2199a98c35c6aa35232faa5ce22debee9152edaf324e97. 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/ES5062411406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc84c41bb6d3c837f693a73441495080a1eb1068c0b48ea11aec89c9432a00d7. 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/ES5062411407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd20fa44242a4aea69dab59e105d3038b089d371bd5fe392f3a94b395d6cf9ec0. 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/ES5062411101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599bfe372d9f7c232e0ec77d4c0a94b2c9ce8f432c4f366dfbbf973aea2fec83. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/ES5062500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01432acd456fcea3c3ba129aa54321a6f602f1f9d14e0807feed6222c294e5c. 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/ES5062502301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a518997a88ce1dd12de5c33ce29309919a25044ca94ec95f26052f4ec29b61. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/ES5062502802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea69ef3fe0458a78422572c1fce6343ead314fb85ec33cc12d0f8235ab95122. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/ES5062505801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e557c777875f675bbba666b64914270ea678190473b71649d38eb4213302e50. 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/ES84D2300052.