PTK may refer to: Pairwise Transient Key, a key in the IEEE 802.11i WPA2 specification Phi Theta Kappa, an international honor society Phototherapeutic keratectomy, laser eye surgery Pilotiruemy
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 0x9b9530ffc793f6a5b6aba96ae75f8a7d337acd1c68199b55c1e98423c660805d. 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/6b02433c-187d-4abb-99a4-9775286a671f.json and https://artists.proofprofile.net/proofs/artist/6b02433c-187d-4abb-99a4-9775286a671f.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 0x1281628aada5278afac48af738dadd3f2ebf3bbf2cbff43516ec13eb5e8ee9a5. 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/BCDFI2200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8857a2a92ce53c635b7f2e282ac502d486d24ecb4c6c5655079ec603b59516cf. 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/BCDFI2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53a5e919fe71df6fd36dd91652f2209deb657c409dd68dab94c963c0757c5da. 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/BCDFI2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffa6be1a14f97ddc2b3ada388d3e8ba0e0f51d876763291ee9b92c04bffb45f. 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/BXIV82389743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe130a5a6c1e0f0ec998612a6ddbae2f639f65a35e060e1b98b4600b8fa171acd. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BCDFI2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a23c1a62cf9178a84c8be4b045fb14814c4bed646e8b7275b089d14f758cec. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BCDFI2100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b9c92059e45af792512303024cde3064b0b10eb055e691904e575821a9794f. 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/BCPTY2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb515be78cbaa338b644a3d5366afd766ea003fd0a717c74c2644ebe0805d6966. 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/BCP0O2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e47c3730484b19edd30954c86f6d7000736ab568289a8f9ebcc08b93f9dadea. 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/QZHZ41929776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a515bf660e685c8e358cb57fc1f7ff8b68e7ffe84cf5eac852ff319f646cb4. 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/QZNWU2050036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1685106bc47a83803143eef26bd710b132030699b86ed238dd153a0439a39151. 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/QZNWU2050037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193de574f70bc8e97e5eb1ac97fdb809850735c7383922c62868ae92a5e4c484. 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/QZNWU2050038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdfff29acc4d9cedf611b0f8f79c5bce2472d952d30f66359307965844ad330. 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/QZNWU2050041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76140e5adf73839941145b85eff72453380ac8803dbff6fbd9d77df19e3d65be. 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/QZNWU2050043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479326f7401c1ff2f9ed479d54b5b5e640cd7716822209069c8fbd0d5d48a963. 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/QZNWU2050044.