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 0x316a2d80ae4df87018224b54bd34f6bb1115aaec3655bfb7375e8d8aaf43d836. 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/9f44da7d-50a5-4c55-9570-8423ed303927.json and https://artists.proofprofile.net/proofs/artist/9f44da7d-50a5-4c55-9570-8423ed303927.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Macbeth, Act I: Witches' Chorus. Che faceste? dite su! - Giorno non vid mai
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 0xcdf3e1b58c74c78b0f0225b50fc2180b1b28cdd139b59e187f460543d8f60a6c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631225 — a six-check JSON result.
Macbeth, Act I: Due vaticini compiuti or sono
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf71b9fcf0e970aa399cdddff22473f1d70cf1de6ef03b4357b74a4d7eea1c55. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631226 — a six-check JSON result.
Macbeth, Act I: Chorus. S'allontanarono! - Nel di della vittoria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af89baa6eb3c577725718d19c5f364a268e84200663da174017f70bbda74a33. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631227 — a six-check JSON result.
Macbeth, Act I: Finale I. Sextet. Di destarlo per tempo il re m'impose
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a334ff7dac0f9779f5d8a9307c075327bd2c1e760b0bdcd454a4bfd5cf7fa0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631207 — a six-check JSON result.
Macbeth, Act II: Chorus. Chi oso mandarvi a noi?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cda0c1e695f0e86dafd34b22c4c454d1c0ef2a1d7b8942815e6b0315cc9ce2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631232 — a six-check JSON result.
Macbeth, Act II: Finale II. Salve, o Re!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a68251e5f4ad1dac4c1821050fb2d73eb60eee1331833d0196be6995b5a635d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631233 — a six-check JSON result.
Macbeth, Act II: Si colmi il calice "Brindisi"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f356965ac5a1751644405e1ae6c233bf3fc5fcb140a338b12bfc36e61fbad60. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631234 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f87b043439066e0d1c4cb586c90d4b38cb4b8e66baf263a206a21faaa9cfe9a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631235 — a six-check JSON result.
Macbeth, Act III: Chorus. Tre volte miagola la gatta in fregola
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa160d4c2d550cf7931fca6c7665ae73d36b61ba463a3bac2388e73563de6e45c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631236 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a04b585862e76bba0af64bd2942f9d186c63f05f997078e4eaf193a126636e1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631237 — a six-check JSON result.
Macbeth, Act III: Fuggi, regal fantasima
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3052db0520b7658fb1c216cd7b4689f234b8f05fdf751515ba3238088f57df. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631238 — a six-check JSON result.
Macbeth, Act III: Chorus and Ballet. Ondine e Silfidi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a23752340bd390a41375869478075d27376e2df4026de427361b02954f26cde. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631239 — a six-check JSON result.
Macbeth, Act IV: Chorus. Patria oppressa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdced0b648f66f79aaa6630352cf74a6964562db8c2809774d835c08ce7f66c79. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631212 — a six-check JSON result.