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 0x5ebfa5074f7ed51c1ccb03aa3895bbb9e5602a801267edcc18c89969bd891e1a. 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/ce690f05-7a0c-4199-a114-d637bfa984cd.json and https://artists.proofprofile.net/proofs/artist/ce690f05-7a0c-4199-a114-d637bfa984cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Capolavori della musica classica italiana
Gorgeous Guitar: Best Loved Classical Guitar Music
Clarice Assad, Brouwer & Others: Guitar Works
Guitar Sonata No. 1 in D Major: I. Allegro moderato
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 0x811a9ed91d8a765e4d62419576874d4e9e723007adaf944f7cef73f721a36472. 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/HKI192200706.
Keyboard Sonata No. 23 in D Minor: I. Adagio (Arr. R. Oliveira for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563907eb01bb5c3c2c35d236de6547935dfc5a308244d84adbfaaec2080dc79d. 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/HKI192200710.
Keyboard Sonata No. 24 in D Minor: II. Allegro (Arr. R. Oliveira for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866ee11f02c3d359042d6dc9351346cd3359c9ac26d3d476d99bd4741667238a. 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/HKI192200711.
Domeniconi: Sinbad, a Fairy Tale for Solo Guitar
Sindbad, ein Märchen (Sinbad, a Fairy Tale), Op. 49: Cycle II: No. 6, Heirat mit der Prinzessin [the Wedding with the Princess]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94c63ac93ac060a526bfcb0c77f72abd2f2ad80a78e43ee4228ef44ce8c8165. 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/HKI192224213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83017d1ec12cbb57e0ce92ab85536df891cf09087e63cd26d7ddb70f345743f. 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/HKI191800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f7b0ae16e9b754181ce264ed482da93e9dc5796d4ed3cc1e17feb95220a789. 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/HKI191800103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb5f221c11fe754149e9ddd99798018335b946c7ece2667b95ce790ef02a253. 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/HKI191800104.
Danza paraguaya (Excerpts): No. 2, Jha, che valle!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a2b7d2314907e667109d021a7288d5a2e270269b795bc8cf4a427447867d8e. 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/HKI191800105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc491e3c160d3f6d36f38346a7b4918a2370a9c554d19808240ab67c519ca2aff. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HKI191800106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e4b9dbe56e26882f8cbbe3aa46996df3bd72f8949a418fd8898b305979749b. 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/HKI191800107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97b387166df4ed95d60e23fcbe5ce81a8b8c082e8e3c5192afd5a5f82691ea7. 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/HKI191800108.
Bicho feo "Tango humorístico" [Arr. T. Morris for Solo Guitar]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4609ed7672501842265033b9ae22c108f1d87d969563fed4f95cc6cb281a24e3. 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/HKI191800110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6548ed507242d040524c5af032367f0b493c16fae7d9e8f9f261d2557d4dab. 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/HKI191800111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463b4f9e169b72da0272c4765539f1c1a37d7846a30f8dd12fd4814e7f007b7f. 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/HKI191800112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56c27ee408b16020d0d91c5a067a9ec123333bea6c9fb2428dec61b57bc18a0. 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/HKI191800114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d441b1b68cfe4b46592cfb16253ae1cc7a95b13119d6523e3af38fcf6a5a16. 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/HKI191800116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57518e127a1c7edf7c2f5647fabc1fd75db3e768a12a83678dbd90f625e1f25a. 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/HKI191800120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894b61340990ffc2e6b2206e331cec5f7ad8123f8bd02ab072d3490d79354639. 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/HKI191800124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60dd3b066805d2616591c589e41bce5060d3175cd37db7dd7746f76a242ce18c. 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/HKI191800125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3ce88e3643d45af73108660e1d5c401441062b60a3f4bf36e57b83f6f52396. 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/HKI191715501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6a17114807586f030f2d446ba7992b05599b815633cdf1c8b0d839669b71f2. 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/HKI191715502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc610e385ad7ac190748661f10ee8d0a971803177bb6506e5872e2647218f8fdb. 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/HKI191715503.
Schnee in Istanbul & Schneeschmelze, Op. 51a: Schnee in Istanbul
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02c1d0d998300bcaa0262cd961159cd6bc29c2e00cb04aaa60b6eb60b71a830. 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/HKI191715505.
Minyo (Variations on a Japanese Folk Song), Op. 50d
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfdf6115b58454cfc5d26436cb1e4b9f6acc1030c6907ac6e54add41aeecaac7. 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/HKI191715511.