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 0x77517fa5ce6e2bc079b5c1f73f3f63bc0939aae2f4998bac74e1486053b38412. 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/f094ac38-08b1-46f4-a706-bf7cfdb524c9.json and https://artists.proofprofile.net/proofs/artist/f094ac38-08b1-46f4-a706-bf7cfdb524c9.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 0xafbe9902d3ec7ce2634f3381792f59f7ed1d709a2d2ee1f69286c0b9bef886c6. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZES52095861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e7c07ca236b5248d5d20a516de0238450a41d6fcefc5f2bc2ff2bd7de07c45. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZES52030023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf01cb0be9c9dc9676ede16bafb3ede1cd53fe788417552b2636c2f416354ab6. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZK6G2039806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dda9a5d494c849227964744b2f2a3237f3808ffd45341100efee77b310f520f. 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/QZNWR2074893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e7b0c54668fcc4d30e145a9246ce71f27adad241beee070c4da0f0bafd8735. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWU2074071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16053919ec0612fb58acd546c1a50e42ec8de3b5cb48b5f7037d66c3cc3df82. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZDA62150812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2a6ccb8b9bfe45ab379d8b410b9d3349398f931abe9bfa913e3745c0936ddf. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZDA72139072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcdde29cd04f979b81d8729b9a867aea7a2b7585260c80aa4c34a6ca2515f33. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA72139073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ec3bacb085c1a7a0ce4f2fb5b4165c86ee45fdc8a71716e987e1309b453994. 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/QZDA72139074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1c67ac9ebc000f39cd49024b671e69b961f3db74b07191a00458f4b06bdcdd. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZDA72139075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da26ec634552ce6ae6cc8c0576fc4a06a30c896d744a5adb74ad5cca7e05668. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZHNA2174287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22463ae68317fe092b9e3c9bfcd2c33e30ea77002eacd2d394f85adf5d293db. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZFZ72214793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e306ffea1306b645fec1f6f443a5fed890f1edec23031e261c4c2c29121d1fe. 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/QZFZ72216576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10131af54ffcd24241c834b1d31c55ba466b86dac0ada011f3fe48ed7d7c46bf. 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/QZTAY2302227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33638ef06eea7e5107288beec04e713218c8e09a367397a3d984ebe84f9d6e0b. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZNWY2449554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb8bc2e518ad76093a1947460bc8e2069dacda90c815df91a219fb684147edb. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZES82471432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb8bc2e518ad76093a1947460bc8e2069dacda90c815df91a219fb684147edb. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES82471432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b15af6d7fc8a1277eb92371dc240013ae16861e723815ce044cfa899356dcd. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZK6G2497636.