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 0x294d1cb7c0a688e26f75c8387edb55fdb91d9963d2b1a2e7c184f3274d155912. 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/5172a07d-d942-4941-8c5b-08c09f71c302.json and https://artists.proofprofile.net/proofs/artist/5172a07d-d942-4941-8c5b-08c09f71c302.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 0x6ab4ba3c8e902e258300e930b2c064e3397e07dea97a1b9e99ea18c6eb2953fd. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/PLF242209333.
Szesnastki (feat. Kosi, Ero, Łajzol, Siwers)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bcaa4ed1e61f3bb4f3c37e43d099ab989d27afde01bc68ec99a8556c0a153b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLF242209334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b7f062c2a812925395f3803552236d402238e4722753ef1a11d69c2d09d76e. 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/PLF242209335.
Każdy Chce Być Kimś (feat. Łajzol, Pękacz, Siwers, Ero)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77079b98dd9e3811232a0fadedd8224e485ba99f057f8e38ff010095e92736c. 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/PLF242209336.
Tworzymy Historię (feat. Ero, Kosi, Łajzol, Falcon1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8eb9ef0899abfa867e67545b2af182cdc279601ae03ec44f4b99aaf82e5678. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLF242209337.
Nieważne Gdzie (feat. Kosi, Ero, Łajzol)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5b6f079417a741d5852741d225f5f778dbf5957d5673277f30085d7dc85482. 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/PLF242209338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0282c5fe0cf1df38c07264c5aa8f33e8f2f13808d3e2ebfddff1506029ff54c. 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/PLF242209339.
Bomber (feat. Ero, Kosi) - Steez83 Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704e93e4e187721edce1257c5dc9ee44806f2f0c2b515b48e91364ed546a23bb. 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/PLF242209340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b97dfef90145e1be39459da597fc5019e4914d6b74b5a4f5a39e2a8c7441a44. 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/PLF242209341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6c4888d905e1c9a43852be8fc238c63650cab2d49bbfa4ef6f48338ee9ddcc. 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/PLF242209342.
Wspomnienia (feat. Siwers, Ero) - Siwers Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ca6ac1989f4888665a81358dd5961daab37ab9f84b417884c8ee9ae946cc2e. 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/PLF242209343.
Panorama (feat. Łajzol, Kosi, Ero) - Steez83 Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bfc3ee22297dc953f6a6099eae06325c6cffab5d60ef55dda17546b0cfb528a. 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/PLF242209344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c49637d40dd114eb8b2718e163c73617270930bde4428ce3b7a945edc1cc4ba. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLF242209345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63166148369605d10a9e5fdc76f2b0c0934d6ff6e7e8bb35420a8eb64421e9d. 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/PLF242209346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec261f2a562e1eae72eaf084c5dec7dba310752110aa41118dba6bd6eab3759. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/PLF242209347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a53387a0289c1e5c18bd3a416cb99d9f8ec8566d30b1fb6c37bd15e8e5d983. 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/PLF242209348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa5a45879b221b9dc481d5d3b1cf220515e7bfb26533bd06f296c16ab5c39d9. 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/PLF242209349.
W Ruchu (feat. Łajzol, Kosi) - Szczur Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c90f06b86b38df66e3f394f27d5d57ae3b627423c23bf1582de928ed0b7a1d. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/PLF242209350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90deddb07760ee32c05149f4b614243725d43def835e70ffe21ea4ee6a52f078. 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/PLF242209351.