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 0x7fc7e17a6bc48298f818fefb5447c8afbfb9429710e5dcc54eb05b243b25f494. 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/9c08a42c-1d22-4930-9f49-11a0f10c77d3.json and https://artists.proofprofile.net/proofs/artist/9c08a42c-1d22-4930-9f49-11a0f10c77d3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chansons populaires Espagnoles (Mono Version)
Various Composers: Nadales Per a Cor I Cobla
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 0x9d0090c645a66fdf07f9b6a502f1a0e14355bc92ade9901fc232a2f842604b19. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ES5060702408.
Recordando a Duke Ellington en Santa Maria del Mar
Els Segadors (Himne Nacional de Catalunya)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2336c1c5cb14bb4627027c9661b8fb2a8bf46bb3da6782087fffd280c326d7f. 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/ES5060611906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ecf73c9816638a2026b6951e0c62241a583fc61d968bcc6f6e2106bfbee2bf. 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/ES5061203718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c4b918dc4e7819564d8127ef88c60dd6894750248f6f14ad15d04b81d08867. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ES5061203719.
Sardanes Cantades, Havaneres - Millet, Morera, Puigferrer, Marraco, etc
18 Cançons dedicades a la Coral Sant Jordi
Els Segadors (Himne Nacional de Catalunya) - Single
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef493e6d7ecdf4ff6cc0b082bdd062d8e2786261d13081a53ff0cfcbdfa449b. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/ES5880700134.
Cant del Barça. Himne Oficial del F.C. Barcelona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3f83aab9841470e6aca9795d08b98dba9046a6e9366590907ef7460006a6da. 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/ES5061117401.
Ara És L'Hora - Himnes Dels Països Catalans
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d6da83e297bf4e184e3bede64bda9cce1c97b74950de819c7ccf8ba865cd91. 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/ES5060702401.