BlackBook is an arts and culture magazine published bi-annually to print and online. Founded by Evanly Schindler in 1996 as a quarterly print publication, covering topics ranging from art, music, and
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 0xf74f513f62180c87b8856887cf506ce268c5e506649033fcc23eec78ba2e615d. 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/8f9bea5c-1f6e-49f7-a057-3d51d47a8e07.json and https://artists.proofprofile.net/proofs/artist/8f9bea5c-1f6e-49f7-a057-3d51d47a8e07.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 0xb291ff1ee6778834e1ddf676058271a564ebe4a6682c9c401f1b6ac2e0e72992. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEOU81800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bebe0e2d0682c3952985c403fe171bc447f1c6afd8e57f03c302c6dde2ca36c. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/DEOU81800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342c1bd6f2417d64f3efcae18a704417cb49173debf484a567af3f657713a39e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEWG82200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8124da07b1b6f3a8c8865bb14f7e38040fa2a5849194561dfbc3430f8507a90. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DEWG82000322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3f734cc7a7cbf9dcc204de5faf9aa2aa2ae44c782dcaba20d2819d22350241. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEWG82300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dae16a1ea603b873f61ddf7848a787fac5ade913caae25ef91178a6e3bea9d9. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/DEWG82300227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2441ebbc4ff1742a994259f0c6b1f9ea39a0431e91e0582a6ccdff1a461d793f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/DEWG82400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdc8e3c575f2a28671af603b244bf58d84358f556d56e5ed2d31fdd317f37a3. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/DEWG82400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da6dae9d256f46a28694169f0846dc98b3eedaf24577098e9556cf59a7f73c3. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/DEWG82400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d564b5b4fd1839164f1edfd88e84a5cce743ad64e1959f37f4bffaa5ef277a. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/DEWG82400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497f35ba7152df14cd01db4ffb43b1ee30054a6f179553490a2bb71075771a01. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/DEWG82300200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61851f92f28dea76a689b78b4162b626a8f79e1b3ac2f2397b617fb0090ceb14. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEWG82400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea57592ff915c67b71c165c382d40bb62784ffa3eb9470c327e09520c70e71d. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/DEWG82300181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ad99718b7062e700256c211ca75641c2ffb3ed5703d534bf32c97c143e0fde. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEWG82300157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f6ddf1f918e30147152994e52659a984461c81483b6e49c7dd2672ce98099f. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/DEWG82500119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfdb44e0d6e23e8e2cd601fa8f61c5843121d1e93464ab2d532b51f7f6b670e. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/DEWG82500057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58af8e96526d823af9e5fd2ee8b3d4818285dafaa03428bc512b01518524092f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DEWG82500158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0cc6b30be2d3c7323eb2e52714097ef3b1e00f18d28e69f4929e3b3d60e041. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEWG82500153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb0e42eb894b91a4616c07750ecb71f2f78599009c12c10fd2a29cb0061c7d2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEWG82500140.
Captain Spaulding's Smile (House Of 1000 Corpses) - Blackbook Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8478cded9fe1a0b1737b52c7427af5ae3559699310239463a8c9251b5b206463. 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/DEWG82300224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc808077cef3044248dd4770ce014b7231466be6f52965436f06edd435e169774. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEWG82100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3f734cc7a7cbf9dcc204de5faf9aa2aa2ae44c782dcaba20d2819d22350241. 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/DEWG82300041.