Black is a color that results from the absence or complete absorption of visible light. It is an achromatic color, without chroma, like white and grey. It is often used symbolically or figuratively to
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a530b5376658812ee5af4947565e7b3e464d67f2b658b76939cbcac1410a726. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8de17d70-0ed7-4523-bdeb-00abe47720fc.json and https://artists.proofprofile.net/proofs/artist/8de17d70-0ed7-4523-bdeb-00abe47720fc.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5166de65eb7f77c95e6b305d7c76b2f385c3d4730f446f0a74809b522dae4e. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/DGA082291240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fab361e406b8c3acac8b1e13969d462ec38835334da5eb693510a80121125b0. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T16:55:42Z), 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/DGA082291242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876bc1771e6ca35758a6dcb17f645ddb0064bc6fe8f620897c1b2df30d687e35. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/FR10S2319332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58fce238849a3f016af35bfdf388a03281f0c9544446c6e459c13d4aadeca0b2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR10S2319339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbf37b5a69b280ccf3245291080691b51edda7fe24628b3e83b140db6bfbdf7. 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/FR10S2319341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527010377ab042653f01c3920914e502d1254c5708b4cb2cfeac570e5e6d6385. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DGA082285900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc50abdca4071d6434c51b3315fd22c0fc94b67fcd0fcd26bd9a2c747c4ffa25. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DGA082285901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4778d2a8c4b593fecc5852ac96d46fcb34a4d1f606140b3167dbff6db594ead1. 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/DGA082285906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68182617057a6286b6ef86e5b5c7a2c7c6eddced4a8ffe015312c4e38a0bde9. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/DGA082291328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfe10b322ea66968e476e769d2dda61a27f7d47153ca80821ead908aa9df2af. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/DGA082291331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb3c2e07ac91bb5a859fc319aafbfebf9d02fd495fa7e3fe46df6cd136888b2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA052348599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf181558135a201775667c6ec22d796c469aaa436bf3ba5ebcf039af8b190750. 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/DGA052353694.