In science, computing, and engineering, a black box is a system which can be viewed in terms of its inputs and outputs (or transfer characteristics), without any knowledge of its internal workings. It
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 0xf5fef823e34ad4875f968dcdea31a2eee9cc77389c9c69e79fa9a6a95bb4a7ca. 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/0380b49f-bba7-49e6-8698-dcb1b8880335.json and https://artists.proofprofile.net/proofs/artist/0380b49f-bba7-49e6-8698-dcb1b8880335.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 0x01fa8bee741e5c5eebc8bdf80b6debf60e37ead85f1912262ab8e42e49bbe690. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZES82284620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd226c19d18ba7ae2a0fb31ee840c6c166d9e5c7a5b32771b93994424e3193fc2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZHN52239870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc28e385f3f564eb7cd995a2cf20bbc2d929721d1348c584251bd60c808972f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES5052200446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa3dfbfde0f3f4458d20aa50ce1478ebcd0d697abf2aceb684443a665da48979. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZNWV2276630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a84f1e7ba4a8a829a58630494dca761fc63ca3449dc1768544d3cc35fa11c0. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/US83Z2320042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b216be8d9b822cc3e474eac3db84771582f0406415b341119cd690b732f137. 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/US83Z2458253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14360ebe8b61e212d1e917e634a88ae45c1c63c2baec1ecec7034388847e16cf. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US83Z2464359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023c7c61e4be78c2badc1f84d6a850de9f09e4905d65e26fa5a28acf52560aa5. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US83Z2470246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dcf2cd88fdf469aeb3e6af9ff31290a76acfa5ac98973e3acc4eb9a34453a2. 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/US83Z2470394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77595cdd3fa698d0ea3ef435b66f76c79ac0a18acb5cd3106e14a09c1b92028. 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/US83Z2481079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e41a9a38e815c24e41997680f873041efc4dadf5f6292487b12fd11cab0068b. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/US83Z2486021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707d94e41ad5b761d8a6af3df4d21035528c05abaebb15bc8f010e0a17fdfa99. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/US83Z2487871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb970d76987576e23882d8538a56a4a12c3236e15e0866b656d281613d11b4f54. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/US83Z2490480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d71697e74ece414ea4b2539656fae88c53603ea930d104f8bb44549f8bb37d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US83Z2405576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163f809cec1703c6598710f0d02a220aaffbe96f2316bc6f96f074770d8b419c. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/US83Z2429699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5627b6f43ffe6c6aefce92a59f99d4488f4efb286e3da286021b524d7c54869. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US83Z2429701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64aa6d866b67c4626aa76c84ee536866f3d71ea3904d5b059f35192e9d558a6b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/US83Z2429700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4deb93a47d98f8c615b7d2786e1b0059e0641f65f13b398af18cc80bfa2de09. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEBE72500123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85a20a00e1f0c2fe069e31e75828da0f0417a09229d074fbaf550de3528b7b0. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DEBE72500124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707d94e41ad5b761d8a6af3df4d21035528c05abaebb15bc8f010e0a17fdfa99. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US83Z2487871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae98621950f79c64c5984d781fc02f7032b8bb149ff19bbfe1cc6d4762f5f87. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US83Z2481210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c409f8da1499cf8e2aea279f7a222b30b5c4a93b198c55c56dfaa09f6b5a902. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA2P2428021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1400cf8c43ed4d0bbaa1e0d5d54fc6b25a5c71644050b4a93ca891dd34d7e7fe. 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/USA2P2414010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80101e38d63c118e88fe1de03fad8a36c34e63c48c10acfee1e52e91c5af68d3. 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/US83Z2355554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbd2d07872c9a587c473b1ea10516119d379a93eee44054f756963163648290. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBLV62401391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5627b6f43ffe6c6aefce92a59f99d4488f4efb286e3da286021b524d7c54869. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US83Z2429701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d71697e74ece414ea4b2539656fae88c53603ea930d104f8bb44549f8bb37d. 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/US83Z2405576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97861eb61187a95a5221aa15de1fa738358927e411f02e60ccb020740fcbdaa0. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/US83Z2463936.
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