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 0x4cccc1f4f324c5632a38f9617bb046268a8b73525331f8a16b2dffe8ccc06c50. 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/15b91ce1-ba18-4d2a-ab7a-675a2771ec75.json and https://artists.proofprofile.net/proofs/artist/15b91ce1-ba18-4d2a-ab7a-675a2771ec75.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 0xf7b458c0fb6757b90f4af084e9639d83b0308ffd9edab63770c0f4902b7fcfc9. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QZL382343574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cbb67da986b0be19b38293c4acce0d13413da3d713b157b719d433fc78de9c. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QM42K2013304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cfa2fd5954bd266d5825aa4203306c7c9e34895652a05b19982ff1b63a543a. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZKDK2088530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fff1c0ffc0bf8ad10089a04505d120113f84e717c8ff1f45cf2bf9ed3489bcc. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZS672119378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e565c84d00dafa4f5dc19b3b0ce70a87d5c554b0c0863eb43e783a8d499436. 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/QM42K2275316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1a64fb7732698747e26a63dd6a8f4511a2b2cc281fcfb78592ec6d42572d32. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZS652256970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1325ba04283037b4a423c7bd63de749f61a005960782e71bc234cb96823ae54b. 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/QZKDK2265611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1325ba04283037b4a423c7bd63de749f61a005960782e71bc234cb96823ae54b. 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/QZKDK2265611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7a5423e8387408bd1d7014ef52120b6ebf541d1ed9a9ab8a49becc4b19aedc. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZMHK2282931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80cad117ba949d0213a1e9102952a2a7fbe3a886f65cae95888630bdacce185. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZMHM2220753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6159d55b2ada88020ba650f21eba291cf048f7b278c06404314fb28054da3b47. 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/QZS672282233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81c51d0febd11cc2f084dcf09fb11bb09f8876c546e6c82c52e69672a641fcd. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZS672259301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81c51d0febd11cc2f084dcf09fb11bb09f8876c546e6c82c52e69672a641fcd. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZS672259301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81c51d0febd11cc2f084dcf09fb11bb09f8876c546e6c82c52e69672a641fcd. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZS672259301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677227935c46d6d623dbf74a8127ae0010f23ccfddeabf4ec9fc01fb538d5bca. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZS652236062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63309d0d539c0b4bbd608a9d46615942d5b5aa962087e69a4edb7deafd866cc. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZS662258763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63309d0d539c0b4bbd608a9d46615942d5b5aa962087e69a4edb7deafd866cc. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZS662258763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb6bbaee90cb21392bdabf8550b4e32f9b548d8a71c216a8c2ebfd0c8d2179f. 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/QZMHN2271871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a560a731c7a25506a242b4ef2162b36997f968cc47cde935eacef47f07f65f. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZTAX2264053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a560a731c7a25506a242b4ef2162b36997f968cc47cde935eacef47f07f65f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTAX2264053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b9c97d35f2adb3d60bf8e67980cd701d9a1641af6577299f40f2d88d4acd71. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZMEQ2253055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a2eb91cb38eed2f989e3643fbd9384355035faf0c46189eb63566c80af3d9a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QM42K2306860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf0653e4bdcac584f9589fa41e295b5a0863d6c5a2cc5461cb8310e2b9b475c. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZMHK2316703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41b28b28934c705086b804e32b736fdf06c8de2174173633a9cb0ecb8748dc7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZS642339667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41b28b28934c705086b804e32b736fdf06c8de2174173633a9cb0ecb8748dc7. 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/QZS642339667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e60175a7fe776d24f7013d678a488b693e12fb22af6458c9a9d42accdffc831. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZMHL2358208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf03577d4e7ebaff26a48446304453d6a33bcb24e2488ae92cb3062f76f8a71. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZMHM2373824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca096ae9c1a5217958e9c67ca3bca17130a847f678d539361d77f0aabe2b1b51. 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/QZS632373464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd90ca535e02159e6d500c2ab49cf0ebc86fdf5be6b32fa11aeb1ab5482252de. 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/QZPJ32493776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d8c8cc4dcd51eb37867919b57b173473aa96f5f61736910983212f746ed364. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZPJ32508030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba6787ac67509ce08bccdceb9deca8bd780c02fb64555e173eca7afc7bf09db. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZPJ32512109.