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 0xa84d8189eac9df3853f0a05faab34105ac14b762c3309c2909f396b5044ae602. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3eb5969-ef27-41e1-a1d0-8925b4db9e49.json and https://artists.proofprofile.net/proofs/artist/d3eb5969-ef27-41e1-a1d0-8925b4db9e49.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 0xf8dd65ac5d1c92236043c410abaa238aa5f846f15aa19ba32d908c116b207b29. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/ES7140700046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919caecb7b42c3d647e4c544aec9d6983cdfea3a6aca28e5af34723152d2399d. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/ES7140700052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf778241595f3187f75641a71613060b646bf643b69a01dca784cd79cc212582. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/ES94B1100118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46aa7c17f3b5d3d7493de8da4a3778d62aef62a8263a2842a24736f56e39b26. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/ES5152000746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46aa7c17f3b5d3d7493de8da4a3778d62aef62a8263a2842a24736f56e39b26. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/ES5152000746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50091413a1fc185fa078faba10d5686095591586307a85e20d766bc580e21d65. 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/ES5152000388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59918ee010826017e774116b5b3384e2931b34b364b2a9cfccddfa920735419b. 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/ESA571700106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a668516f071924c8c0d92b57bb0fbce0380312bd3669b43f52d66afc697b26. 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/ES5050301112.
Altres Cançons de Nadal 4. Un Nadal Amb Nens
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8450db0647e55808856bffdda0d1f357c246375a39d855dbcb9f9c1962d86c87. 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/ES5950702452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db0a1e627ac37ee03bf94053c77999c93c333f55deb1d5ef03dc219aae301b0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES5950702457.
Més Raons de Pes el Tribut a Umpah-pah (pah)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb23ac695d19e5c70b725830dbc72168a8998eef3998f833a621660717d02e39. 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/ES5950903232.
Podré Tornar Enrere. El Tribut a Sopa de Cabra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4d4a4abed396d8061abe683fa27bd3ca3b66a61b058657b2839c29b105fc57. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES5950602128.
El tiempo se puede parar (feat. Bunbury)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f413509eed54d2bb47931e1c1bb6c44f28b14dcf9187b75eeb2dc556a43f5f. 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/ES7140800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9992734943cd14dd5be71a5aa8062f105fa2084866bf24aef5e4ec9170c5dc91. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/ES31E2400892.