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 0x55bdadfb3bece61cf7e9bb9f721274a26d7b9dc414ca536af0f37e9484df20e5. 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/c6494da0-6752-42d5-9e86-b079607d5425.json and https://artists.proofprofile.net/proofs/artist/c6494da0-6752-42d5-9e86-b079607d5425.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 0xf2b298e97da66a31c28c060cbfee602ddce74536e55506297c87514e4307702d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZDA61955704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e7d644e586d65d6cbbc432f485965c009207d48c096678ac01e9366b677d72. 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/QZFYX1986477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb9cc5d59d796102c7ead0e225491760d56069d53cba104001b6cd4398c8229. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZFZ41990979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd98fbd2baf2cb9da54bdb11dd90456b592845b03e19e74c83430e12c4032bb. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZFZ71942067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b33f2e42ef1dcfcb160afbd94e49b3a49b1299c72b521b1998fdf100b22957. 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/QZMEP2002145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ea6242bd57b3e6159b46326f435fe1b94f11e1614cc3da8f68410ecdd55939. 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/QZNWT2192339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88739abc0f437fd84b8dfb7229272984d9aa5c9009626747c1a620e98f4a1c6a. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZTAT2138819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92015965daf583b2937545eba9f8c51a343d6accf7298df66bd6d0d577f6877c. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZHN62283953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b97cee13234ce05ccbf74f89611a6082b864be87bde37986bed0cdad3be1a8f. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZHN82426489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b81041ebe20f13d866e5e489be65843c4d3be5087dbd6cea7aac62c5d6def5f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZNWV2411895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf752172c24b499da9f046ca36f35d3e96a0b696e270a459e35b5b76bdd98e44. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZS7J2400640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ce81aad4ac24a14463b1ad400fbd9dba56480e05d35f13a6b8fa82fc961ada. 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/QZQAY2489595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e85d1e0c6002b12b8b647d4eed3c76583785d9b8e8f57c5410cfb818e0aea03. 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/QZKDK2266743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884a6d7ac9a1e09f5c974c6fb2f1c86c124d49599c9ca832937e8a6cfd9d33ac. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTLA2536014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12124dcda729f4a45330bb51019be3a704b9d725eb3a3a8af811c69f4ffdd037. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZTLA2595000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9cae957f1ba85d68ecb281c1ee2a1b81e592f93b48642c918dd4896347d95a. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZTLA2520236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7528d9abcc15cc522f3a788955892512f608bfb3d79cf6b3b77dd77d1390eb09. 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/QZTLA2538654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09cdf22632fe4762d366d754d84603a9a02fea17cd2307cdea32f23881a01b2b. 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/QZTLA2502128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2454012dd1024e2b611dd40a53f23c108a383246272dd48e0ba4e44104e85ea9. 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/QZTLA2588827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de5e38082f147719f4423e4578ead7566567536767e9e372646168facd1cfa0. 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/QZTLA2539366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf752172c24b499da9f046ca36f35d3e96a0b696e270a459e35b5b76bdd98e44. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZS7J2400640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b26fca455abe9605cda44439d29ed7542e3e6bd6cad14a7b4285412fd7b41a0. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZQAY2516667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb743991c0939834ab92d9a629d996965702c74d793b45b034cfc5da6f89f53. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZQAY2595578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175981ce2f3987b0dc58d35209aea28284e95b586fb3251bdbaba2086950b71e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTLA2588759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e85d1e0c6002b12b8b647d4eed3c76583785d9b8e8f57c5410cfb818e0aea03. 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/QZKDK2266743.