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 0xce67bba1ae78c8d3bd86d668156482a4f4d66f7a97b83a4859014cc0995a8d3d. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe873b88-4ade-42ae-8ffd-cc08d88387bc.json and https://artists.proofprofile.net/proofs/artist/fe873b88-4ade-42ae-8ffd-cc08d88387bc.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 0x7b3ad356b4b1b239e1d4c3e7d3c4d443801761c3f011cb74c096d48bc9004c0f. 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/QZK6P2157140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a3d50d0293ab92892e56d0de446b7ce8b6991eae3077b60a996d2975b3f196. 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/QZK6P2125920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe742ed5719cd741d15a9c16a9a1e7350495760bba3617638c9573dc9d8457aa3. 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/QZK6P2157228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fe988642d8393af0c4db7c62affe0f0c7e35f3793cce425ed3b51c52a7914d. 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/QZK6Q2196372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9250301df48d69b8ad91b8ded37db81df80f6d4f33d78e10a36889ad2eec88fc. 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/UYM121705005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3865a95b0d96926d93a87da026989ed35d9ff227a8907eb5c029ad5e207ace. 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/UYM121705006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119d315f362be297bcaee47bf1042470a568251ce8c92d17c6d8e0fd1f698b76. 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/TCADG1704220.
Oficios de la Pobla (Oficios de un Pobla)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a9b9019669f042cb72198d84c920ca43681e833db76eea0e56218ac3adc39c. 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/QZNJZ2382402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86a20ffbfb4ebf59a7fd1174589f1f1d9ef373b931165f843f9a39053a90d39. 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/UYM121705016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9c72e23bee4713d0f4f85f0d3db8946118d24dd6760a94a210e385b5936e4e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USUYG1267483.
Broken (feat. Muelas de Gallo & Dj Vilaz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d5f11649f933a68a8f3bab2af517c76777c019d7025312bc186924ce77ec56. 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/USUYG1267488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc335d198ca7e9b8eb1fcf15f38f85bb77f486c4986512a8e7b0f53236ecb47. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/USUYG1267489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d51876f85401c57096a4e7e5c0628b27d4532108439a5f89843eba922ea3868. 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/USUYG1267490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbcfcbd0010dbca5b2581809c45c9778a458e1998860299cd791572bfa321b7. 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/USUYG1267492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd98218ccaaa816e3d5f7bb984886bb7a4c0f620682d3a4d5e74828f18b736d. 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/USUYG1267494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c774424e18ddb085063ca2b440fd6c5f2732b8e50c5007d2b5bf9851ad7d8c2. 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/TCAHA2356320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ec1d0df37e91b126bf44ddfaebc325ffbb5b3c81bc8511e1fde7894f3792cd. 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/US7VG2330680.