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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 0x878120750b93ef7cebb801363a6d33968906e43f3ac55c7b1101e5dde813e73d. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3b35d36-ceac-438d-90a5-ccb95b9dd02f.json and https://artists.proofprofile.net/proofs/artist/c3b35d36-ceac-438d-90a5-ccb95b9dd02f.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 0xeec41676cb0d8cf60aa91cf93d991f42b45155f3bd158eac7839c92d5b40590f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITIWE2100204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc4012b43e131925535da7bce2e1427936a628ae9538bd6b6ec645948a3461d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITIWE2100205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe564398861cc8c7683bafc55909e93d1accbdd83d51469f48b9eadfd8ebcebb5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITIWE2100206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cb395091dd6d98936f0a24b121a7315b85fae96139bee553cf8f7e78badeb8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITIWE2100207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ef182b7768e57e81d4bee2127a537502645ecb5f652fe9eb850b53c7b75335. 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/ITIWE2100208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f894bf44eee978b83674d8f0d999a7984b69c425af535949408b71f487c6f2. 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/ITIWE2100209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed4fe1ebd4206472d4b761e85660201fc09dc5b2b78789d4a913ec55ce7a30f. 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/ITIWE2100210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ddef820995f598c81605f8f7999e6c324a79d310c6784f6d06d08dd04fa5ed. 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/ITIWE2100211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2e4a29b839a4ab266a2f0af24d598d3b8ef3bf3db6bbe444b744768bb3d623. 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/ITIWE2100212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61d1017b669e9df722718ab1c80b48f4ae96b2407cbad5c05a54661d218604f. 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/ITIWE2100213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4420b8b427a3a48774b313cc2ce5e9738c63ac8f26bc33be56cccc836caace8. 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/ITIWE2100214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9442a59d3db1b3579e9d6cdac2e19b673aa85546221b2e2dac2ec0c1c63b3f9a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ITIWE2100215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90258082f290cbbebed175731c1c906a7c6af1d3a9ef0f4d6e61ce10a334803. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ITIWE2100216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de74d91d6423a11e2bd37ed43af043e9e76d73724aa99e2ed3a2d135f764195. 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/ITIWE2100217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6b434ae75a178b5e293b566d4bf21f5867f48cb520ab64749aeb9048ebdb26. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ITIWE2100218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8bb42922518a56e0a110f0a3687da5b8bcada93e292cb6b7cfcf26622ceb6e. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ITIWE2100219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbe33021fbb23cd0533476cb39b7630eb7977b79595eb585455abb0f8e1ea41. 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/ITIWE2100220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d9ba5ab834466722c35d48e6ca85d637996b759f6ed6d5d4845a1f2d04ab5d. 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/ITIWE2100221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba23a2fd7fa0f56ce4a80bf2c8e8e4e323f61ce4c787b2ef851e4b111a56a8d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SE66N2203598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bbe2d209e14ab7b09d7f5069b8a6b83f18733bd5ca7dd3c0f2df8d574261e9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZZ782447888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04724e86dc23541505e1741a943c1317fb4693b1b4c5e09c2b02b2924711ca7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZZ782447889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c28321076f7b68f701ceef7e9ee848d29ac49f7a8ee97ca2c04288b648512de. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QZHN81920546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe328917e5d9c212a5d39440ae409d8fd952ec62b51f73422ab1a4e3618a8dd. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTB82217437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ebddd0ef8db78a54ab433d10e870d64d15bcdff83ae801261c2f06d019c0c2. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZTB22273206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c9f697f3e8c38663d05947f5b2d3c4a861e2e365c4c72c4712ad0b5158fe1b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZHN91923774.