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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22edd81adc82c746946bbf644e2efb2d0207d514943ee6158097963d2753714. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e52dc2e-09b7-4f6b-96bf-2cde4dde40f6.json and https://artists.proofprofile.net/proofs/artist/6e52dc2e-09b7-4f6b-96bf-2cde4dde40f6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
El Barbero de Sevilla, Rossini, Grandes Óperas
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649b77a7db8b75d6d097844b18250be7816dbedb6b05dd98c87078ed2b4ccc8d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1588554.
El Barbero de Sevilla, Act I, Scene 1: "Ecco ridente in cielo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377165f098abe7f370e66e47c964e094b143ba07bd77ce2430b5020e591b8853. 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/QM6MZ1588555.
El Barbero de Sevilla, Act I, Scene 1: "Largo al factotum"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06682dfd91b70184201444002d6f91ece9f11ead2c3904ed02315fc3e76bca0. 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/QM6MZ1588556.
El Barbero de Sevilla, Act I, Scene 2: "A un dollar della mia sorte"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc422fd1c4ead3ec598ed1f399af1eb25816b7077d7797bd88fe16edaff81cc32. 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/QM6MZ1588561.
El Barbero de Sevilla, Act I, Scene 2: "Ma Signor... ma un dottor"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01ddb7f9bd74c18c1ae97f5cf1b18b4df7f45edd06a7bd77278df244c2a6cb5. 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/QM6MZ1588562.
El Barbero de Sevilla, Act II: "Pace e gioia sia con voi"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd192fcafeadbd48cffc3ef7842e0b205610c8d9e2abd38c2c9048363b2884676. 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/QM6MZ1588563.
El Barbero de Sevilla, Act I, Scene 1: "All'idea di quel metallo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ceb3aeb4c59c12acc9e93584a6377bc94b227f47523e246a2aec8e609e34fb. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QM6MZ1588557.
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
El Barbero de Sevilla, Act I, Scene 2: "Una voce poco fa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36dae9ffb77f8f275b7e84694e27705de34173c2bce08d6bc3fcaa2a5a96617. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QM6MZ1588558.
El Barbero de Sevilla, Act I, Scene 2: "La calunnia è un venticello"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f3caf176def0245afcf1f320a57e8a6e25fb47375d15ca5da0ad2095ab0583. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QM6MZ1588559.
El Barbero de Sevilla, Act I, Scene 2: Dunque io son"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c273f1c50c4990464d4a1cc4bff275b34cfee530070564d1d3643b6bfdb28b8. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM6MZ1588560.
El Barbero de Sevilla, Act II: "Contro un cor che accende amore"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be2a22c9286b3ae6c9b492326f56bf223b20d53aafbd55fc06927991ec18efb. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM6MZ1588564.
El Barbero de Sevilla, Act II: "Il vecchiotto cerca moglie"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30432c5c856065233fa33507ac39f932b38a00ce4980cc9c748f1652089e649. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM6MZ1588565.
El Barbero de Sevilla, Act II: "Ah, qual colpo inaspettato!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5befb00a6d784bd7e3338f7eefcdf0cb880178f68328ecef07f9d5adee8e5815. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QM6MZ1588566.
El Barbero de Sevilla, Act II: "Insomma io ho tutti i torti"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938ac98b75febca7bdc25ad2b8e50c999da3c99822cfaacc37f24d1cfb447267. 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/QM6MZ1588567.
El Barbero de Sevilla, Act II: "Di sì felice innesto"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1434b2fa780b13dcbf31839aa59438f86957aaa46b41a352b790fc88f4e165a9. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QM6MZ1588568.