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 0x7a6a21a305b293971c649516a0ff992d55f35b8f8e3a301e5e49a4f40a41806e. 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/0bfacba9-ea50-43f9-9823-4b0dd2d265a4.json and https://artists.proofprofile.net/proofs/artist/0bfacba9-ea50-43f9-9823-4b0dd2d265a4.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 0xb02ef6a5c22de83dd89626047f8a4f7fef797ce22357ce7f7779c05fcf93b003. 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/DEVY82300094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f308b880e3b19f3964aebedd754fc916ee3e5daa5f779f2eb7323d14a723fb. 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/DEVY82300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1256fb7a24bf9c9fb6f678129a5c373edc9f71ad6b5f08bd174dfde3e45ee9. 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/DEVY82300147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff798c7932a02e91eaf84e390eedacd9de66b267f760403bca0a29bc5b6f485. 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/DEVY82300148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4cc1e4b972be89d0a3a57593c660a747330fbd83aa274c13c75dec02a6f94b8. 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/DEVY82300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfbecf35d8e571acf6297b843283362c50227d7a55ff914a241a8bb0481a76f. 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/DEVY82300150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee2428ba7439e7f27cf42ee01ea5dfe3da27f6ccd8d48815d7884a347fd6b1f. 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/DEVY82300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695ee00f5e1e584f0a51355e62ab70831de1e6d09a86909ebcecf0d214f460d6. 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/DEVY82300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe693bbb7769d63dba80cf66e8d0fabe8ff09f91ffa669212a9c44f0d908ee180. 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/DEVY82300068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d6674a99a95e8bff74208897664c8fee3684dede4000be0c2eb921a573d7af. 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/DEVY82300151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x777557a2792a34b6e5cf74f2eedcedd6d463eaed694530d855ccaee477032260. 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/DEVY82200049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c569bc35cba1a6d7137164407dd47d95ee8bf08b24ecf4ec6f691e4f8aa2a33. 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/DEVY82300152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e25e2781faa83998fa5e88e7be0f37d33342d049305a67576f18a2cb3422130. 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/DEVY82300153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b4cfc570e4d811523afb663090983d6d359439e9acbd01331b3118bd544733. 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/DEVY82300154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d19aaf4d6dacb8831bbddf4895365c5747adbd308be2b2dbd488e352044252f. 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/DEVY82300056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f11561c2bdd3fe8ba6383459bc215bb2e1195a35faa528402794a7ec8fa9d0. 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/DEZC62383998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac47fe18c4ddc8f131781d002778576b73c022f0b9f7d9e8b48c0f17512146a. 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/DELJ81924191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e636b4b389f33f7ac18813daf6c145cc640c6e4267bc5af7b123c568f74734. 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/DEVY82300081.