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 0xaa4bf9447051e0f8f9f2f153e4595df432df5cd8353d5a09b4551019c902b70e. 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/20cd48f5-d08c-414f-a25d-696232df880c.json and https://artists.proofprofile.net/proofs/artist/20cd48f5-d08c-414f-a25d-696232df880c.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 0x8e43b60fcd53718c1b196267bbda12824d584df1725cab263583b09ccc94c474. 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/QZHN81973244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf04ab608d1d535036af710d3b560e0a33169efc4fed36a8161ed0bbe2a97a7. 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/QZHNA1987967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f6e84950254dcaa47110d139950a1226cce00bfddf90be350b1106436f810a. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZFZ42042549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45c3c222868513767f4bd7f175328a781ee186fc015b21f228ca03f5c5e9e02. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/US3DF2103708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5b72c1bc0f0d4d1ad269fe64dd8ebb2f2db6dd112228a591dd9257a5552e5f. 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/US3DF2103709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a83957a94326057c38d0fc15bbdf4cb44ff51b9a55abc7c05b7b2a5779f52a. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/US3DF2103711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b21ac7cc342bafb0f934a8aa3097ed3b4c8e1236cb2831ee819da74271b4add. 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/QZK6P2191226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efbd3bfbee0074772249e13838811b6f612ed431362287926361da42129c864. 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/QZMEP2108896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3370b3c2f5276aa1d5373ef4bfaf01b3cc537934ef3a5c4d694b165c531faf7d. 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/QZMEP2109300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1235d9bd132ea330a234b1a5232f7f64628d2f404a775884d661b643ce4d5fba. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZMEP2117702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212fd97e447f8d01331b775bca5293fe82725f43d819ec3436d0eaeaf23459de. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/DEQ022112053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83460d29f4f866712987caf49e9e56720902fdb06fc5a2bebdebb9bb94fff74a. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DEQ022112055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348cc0c85e7db27d8249aadebf64853dbc85ef46940f85337f34fa97ff3b99e9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FR9Z62100643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce01ace7084bf8b1b4460bf69d2ea110389cf635057626ee7334c7dca264bd15. 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/DEQ022270718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581cdae82af1bf9f711cdb722d24aba14dadeb4c2d669112abdb8963e67524b4. 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/DEQ022270719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ea026c5c9d12df500dfee5f94de1bc8479e082b6378528c511ec488e305d35. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEQ022282805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4675f0590a61dd8f6ebec14ca6012d4f39bd5e79a24404877d5770d6912c6f66. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DEQ022282806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23498c4a872c031fe961140576c99ae1182b692afdb11a976b19a0ebab3dd544. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/DEQ022282808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ddc008bc76426a4ef7347960b80790cd28c4c30ff49823170f32e37e0330e4. 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/QZNWU2435544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a5e9d0806fc53421cdac8b1bdb2698dd650a15c3c7edf54ab48dd3147dfb27. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWY2426980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da8c235688123f21af20eb442c2c7a907af43ef9849f4c143348a96c96a5ae2. 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/AUDCB1702919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768e0b6604d8901444a744f090e06ac6c2fe223695d74a7af65bad6568684eb0. 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/QM3DF2253723.