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 0x54999cc3b21cebec7c929b5548747cb2aa6084ec50dd7e1ec8bfdc7862648295. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c2bfd4a-bbd2-4ab2-b3c6-bec2f2afbf1b.json and https://artists.proofprofile.net/proofs/artist/8c2bfd4a-bbd2-4ab2-b3c6-bec2f2afbf1b.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 0x4ab8d706da639f432974cc1ac097db53846f756fafa7fe89c9b7260721bff438. 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/PLJ621300971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7319ef5e4db350b55fa406f6738d19eae490c6ddabbf4a26f767d1775a1cd17c. 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/PLJ621300932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff7a73bdbaafb79ec46ef7d2dd7066e850a3f95a18876f3b483a378e6e6e252. 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/PLJ621300933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d49edcbff3646bd859a2618a987762d2f030693ebf750a99afa5a27b219f20. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PLJ621300934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8f45c39b4d5844eb49bd0d1c5e528ec5189e057570eb07a2e3843e0153d2d8. 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/PLJ621300935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a54a2037a32904ab3b451de759bbec6ea339e8f2327eecfdf224c6f1e98c9dc. 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/PLJ621300936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c007d4614b565a8781bbb93b1fa00fa4efff3176df848a27b0c2ff620fb47c. 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/PLJ621300942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3076c2fc63061fa7b223caaa95f696687ca28944b15f95936652c9dc26fbed. 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/PLJ621500504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f12ab74106d9e3ace8f0a6e55a9c7e1c2fb28fb9b2a2904a218aae3a2386f45. 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/PLJ621500505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd66df99ca2e91cb77263dcb0b42263745d85214b4639bb920648a923b970d56. 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/PLJ621500510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff31b66642816d9a2c3f7515b95ad87cb34018e412578e79347d24f5945fd192. 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/PLJ621500515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec64df65e30f9041d96ea48655d1b444a56030652c0c3c029c7553eb59015f4. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:29:47Z), 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/PLJ621500558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24089a353b8fef6b3cc9f963273cb96aaf46488d5979a27e2a416744c19a128d. 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/PLJ621400218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67975b3bb9a5335fdff0c51612be47a5150501a60008431bb96c1329375bf793. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/PLI367912370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4268f1a7a5a193e174b922683fa33bad957ed8d2f02eeec1c3eefc03dbcc1f2. 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/PLJ621400223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03bbf0d44d884d6804ee038cfe91f1eaacd1e6842a08051fa9ebea408d1417b. 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/PLJ621400226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be8a78bf0788c8e9897afebbb7c1550c583db93076c492c6dd1eba1fcf74514. 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/PLJ621400119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12973c4051cb17394e4db17bdfb8856dfac1d9884c1482d209cd9c9fc540dbfb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLJ621400093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbcf531c686b49c8924118465bf9e7827ac943fc2188c0fbe8e0b8f7405d6d0. 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/PLJ621400257.
II Festiwal piosenki Śląskiej – Tu jest mój dom