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 0x46aa1ff1eb9b7889021f20c2b5dd63032c4169937f0a73d829cb97f989a5ff10. 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/8199bee8-bf26-4a3f-87d7-e4c2ee52c765.json and https://artists.proofprofile.net/proofs/artist/8199bee8-bf26-4a3f-87d7-e4c2ee52c765.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 0xddbaa7b44b5be22fd563ec4f962eae9bf33d9efcfaf4a57ffb3305fddcbdc279. 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/QZK6F2017711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414ef8cf0baaa3d5f69ece98ed1dc08a1fa63ac118af8f076f25071dc75116df. 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/QZFZ22061890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b92362233a0583ee74b49267308e10e1e88cf37cad141178e8fadcc2e779367. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZFZ52000809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe5345d48d0f4f2d04366e217a204a174b76d9d73ae0c0c46814e3792564965. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ52000810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b7360ed0e6209cf1570309ab587fc045b8563bb9380940b12c33eabe2f7457. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWZ2221092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0753929afe5461035e791e44d5393e430a3cb02d7e9c80077ea5070838018c7. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZHN42027815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50042ddfcd27f346d77ac1de7d9029d7750f2049fbc7a59ee52b5958d8d4da3d. 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/QZHN92044099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5807f5d10bf3508b4ead3abc8f6855f5bb26774da9e5cf12e730e7fcae8fce. 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/QZMEN2088365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83f18c260f2d53f4d3e2e17b489b9d26a22638af61ca14f9ffc8520387a53d2. 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/QZFYZ2188756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88676006998d5df72219ccf0c8d5f430042d191f917baf96233bd068321f10e7. 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/QZFZ62169224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e89b4102043c17447eb6ca3bcad0cb7f2ae8e3af6cfb1532a2821d5e58a3c8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA72177977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0753929afe5461035e791e44d5393e430a3cb02d7e9c80077ea5070838018c7. 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/QZHN42027815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a573ae142ac9c819e7c3dae660c76beb57c0bc75a24c3644346586886ef904. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZDA72177981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76046f884440976344b85427827c0d3f17af658ce473ce5eae506c97e7e4b26e. 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/QZDA72177984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb9b6c7a232bbc6996f7a482896d3ea1659abb10a6c4b3b7ce44dea315dd7a5. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZES72231704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1eca07a4554cdfe05610ebe0d30636ea93f403ac174ee93742161200cdbba3e. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZFZ32359450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9d883a481f6bb5c9659376bf0cc5651dfcfc83e0f0fd844e533d1db4b67848. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZHN32357646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf663e1a750ede53743b3cf20fcac428f426c47e5112e7765012c2fdeb17fa85e. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZES72434414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f08bab0b279ddcc552a3c8a0733fba34d1e4717247119ba0e7fe6242494ddd. 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/QZMEN2423542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f332882e6beb4ff18a7e831e5e2531c5b3b0d798fb3381af601b9cae06fed0. 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/QZMEN2423543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1efa64d76d4bda5e2fb16100e46ec3904741b3c23b804b5ce671fc81ea0505b. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZMEN2423544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2cbe898d6e671cd85adafd3d49e7b97469b260d6475c436f36dc5b37e865ab. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZHNC2392492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb8ff9aa6ab2b709e0f1fe47337b4bf1d59f983a510bcf6c08d994f180ca839. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZDA42452854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef6828c08ef519ccc54ee49efb1be2e46ff4259686acd554e53b2d82d1cf0e6. 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/QZMEN2423545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19e3e0209504e66679cdf6f68447455da0bc0e3133bd7751476362a0e38fe2f. 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/QZNWR2477714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f04fccf6aff41ce6fcd800159a789747d9a590913309d2755006ffa9988e639. 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/QZFZ72323920.