Grotesk may refer to: Akzidenz Grotesk, a typeface Grotesk (comics), a Marvel Comics character Grotesque (typeface classification), a typeface classification Grotesk, a DC Comics story-arc by John Ost
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 0x87ccf510896c76e16f06a884625df4423a6b5f3543826710ba1b46c22db205a8. 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/84d5a338-54e0-4c30-a341-9b52a701605f.json and https://artists.proofprofile.net/proofs/artist/84d5a338-54e0-4c30-a341-9b52a701605f.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 0x39e5e90742015de5d58d21164f1adba136dd13992dec5b87c6b09b03fd7e0b4b. 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/QZK6P2453284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a3974a0f36699ee97fc2f282637eddecea7cce0aaedd6a2dca06536a70bf47. 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/QZK6P2453285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7398ed9d0678400f1da3822ca3a11ce7c7177668cbdd5f7d24f2676e4f52a5. 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/QZK6P2453286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bb6289aa58b04e2c7a04054c77d8985c6b383ec57e26bd6cd955b60e85caed. 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/QZK6P2453287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ce86bebb5b7477ccfb41f6719ca4fc68100e3b3a7e4bf30f874b1dc192ac0a. 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/QZK6P2453288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3a170cd9334add910444d2c4a3a89fb465ecc7a9832ced8bcc70c89ccb71f0. 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/QZK6P2453289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0720a0d876cf99231ba732d6288448370fa6e0b53323ad6c43c2ba573399583d. 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/QZK6P2453290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037492f7a975be13dfd8ef8c442f70abab2122113ee8b5e4a9588add6d92361c. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:02:18Z), 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/QZWFG2463324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b4fcf2824a954166a30b0aff8c8eca9b0c4db37895a079deb7873a3e28c160. 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/QZWFG2463326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaff1b3a78397b77d12329e4461c8c77a9446f8db037751faada34680ba15f0e. 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/QZWFP2445592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eda7b4328cd9474fad47578dd2c0d9945103880fee49a0f6d95889771d98295. 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/USA2P2466117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2ff4cdacc12c9c7fca2c9ac6a30db06fc79275573a92cb6aaf90c9c09c630e. 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/TCAID2493711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b5a9791b89c8c24ab318765774deb4153dcca8f2b5a5580686456ccf57cca5. 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/USA2P2472901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b5ac1860b238382dddb6f0de3473e49b8174207a51b1a8053ee81e841608e1. 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/QZZ7S2464068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe815fc7be0685b5acc0adacbc173c62df2b088f6a97fc46bc57b94853e260ba4. 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/USA2P2473755.