PHD, PhD, or Ph.D. may refer to: Doctor of Philosophy (PhD), an academic qualification Comics PhD: Phantasy Degree, a Korean comic series Piled Higher and Deeper or PhD Comics, a webcomic Music
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 0x40fbe133e47d960e521d537833f77aed62267811700aa250a8f13c378e4ddba5. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e837637e-20f2-4a67-b8aa-9da5d65aa1e4.json and https://artists.proofprofile.net/proofs/artist/e837637e-20f2-4a67-b8aa-9da5d65aa1e4.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 0x8c0012e4615b8984c98ad51c27f663e29c97df6a88d0445c17ca3a04fc25380e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BXIV82443417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe046c29ba8907be796d6eb92ea3f68396f77978e9bcbd3d477c63811646a1e19. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BXIV82423011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c1126e3205c4e33cdcdbeb5b77e7af3f671b9a9a6b05f0259d88f7fa15cbfd. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BXIV82489206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb445570fbabb618fad3604322896b37ed11c671e75b7b440fcd6e3e092742910. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BC6M22418285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142b9b4829ce79ebd15edde238cdd4b988b53ff99e9fa4d05c5090b341d45d11. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWV32583960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd846bcb185b45f86c5224999c19939c25ebc04c79d2f7d144d9fb1bf5a95bd0a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/BXIV82446999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5f4ca0c13045c36082b4a146e7fc1372703c6088e2028aa59ed654e1fc1574. 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/QZ5AB2424910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37edad81b38ed9b7f0c7d28f8152fb3a273ce700cb065ea4e3bff33ad1892a6a. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZ5AB2424911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241bd7502d3e26501839af5e870be47d96a3359533fa0a6c200fd090cc06e7ff. 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/QZZ8B2439784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aaf6d0d8cc3d73d100fd63773ba47e285af6fa63444658c04e05a69502c3cf3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMZ92484502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879ad37dde9e06cf51fb2d461ddc6c161587ab8e752d3083928ad226cc22af3f. 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/QZTV32589091.