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 0x10c06161c1c35666ab3dc588683af737867150de800513fad8c4357022c8b24e. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b3427c8-2f9b-4d68-8447-eb260220a29f.json and https://artists.proofprofile.net/proofs/artist/5b3427c8-2f9b-4d68-8447-eb260220a29f.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 0xecfa2c7ae5e0579b0beeb255e73882467e0eeeff72a86e96d3244f031c613e21. 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/QMDA61857867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6b2d9903350bdf418f2c7d7c540ae58c1dc41787813aada5ab25c674a1f200. 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/QMDA61857868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2880b5c609d6f5288de3ec008e4c4322b8c72a6ca0e124f79dd93b07eb66e277. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QMDA61857869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a88f5d01d51eb445ce36841586f4f85ec8a860bfe1faf27eb88a59b59fb3d4c. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QMDA61857870.
El gol i la mort (Romanç de Paco Alcácer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57924b54a45b591b6508221b159d58d4502bf1738d22f7d2d5395552e0b773cd. 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/QMDA61857871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b94f1152bf74cbc5c77de3bbd3c73ac358a9a64ec906117325044586833f7d. 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/QMDA61857872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67bc50b5a1a2064d0f0072cee74ed7631302dfdc7cf8cc299992878b2083d9ff. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QMDA61857873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fdb9f28903d0603b763b930cc1d15c17a36bf6e67692227e56ec97604c97888. 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/QMDA61857874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7875da19f77aedd99a55eede0fcc6efbbbce3f2650d2d3d18782b8eab37af26. 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/QMDA61857875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57db46eca42541dcc4ebe92281edf169401b1429e012698e087c06badcbfb6d9. 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/QMDA61857876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aef6778a6b330a2a35fb2c9cebd86f76a5d1354ad8741193d8b6c072c13a3f1. 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/QMDA61857877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a88f5d01d51eb445ce36841586f4f85ec8a860bfe1faf27eb88a59b59fb3d4c. 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/QMDA61857870.
El Gol I la Mort (Romanç de Paco Alcácer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57924b54a45b591b6508221b159d58d4502bf1738d22f7d2d5395552e0b773cd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMDA61857871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6b2d9903350bdf418f2c7d7c540ae58c1dc41787813aada5ab25c674a1f200. 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/QMDA61857868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfa2c7ae5e0579b0beeb255e73882467e0eeeff72a86e96d3244f031c613e21. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMDA61857867.