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 0xb7d82b14466487bff14a1b4bfbfaf4f7e6730b57ff1421a7bbf09c26af225190. 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/1dd39bbb-a0ed-45a1-a140-af3efce39a74.json and https://artists.proofprofile.net/proofs/artist/1dd39bbb-a0ed-45a1-a140-af3efce39a74.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 0x6c437336949a34c485869c7ca2b7c0b08df629e824b3d5a98c5708cd70859947. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/GBP4E1500181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c1a7200a2785f2b8257e253970113e5d1d1b5e0c3dbba7f9e34f34da213fc3. 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/GBP4E1500183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f41ab4e09828ff34fed199648444c6abf6c05247fc0300d0fb2dab830b5be0. 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/GBP4E1500184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6430a0c7932545be766f788d2f2b44d1f45f2f10c3798019b0fc6ffd9c0f21. 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/QZDA51862867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9279dbe54b4f4e1f45c1788cfaa1cc49c0a93d73dfbd208baa7168ef29ff52f0. 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/QZDA51862868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da8055f1e372d992e9dae70b004f24ccbcf00c8340000bfd25cee5c5a21192a. 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/QZDA51862870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fcb88d8d1bad5550f349d9aca8d6c8f16d8e72bbd1a7865cc8880c1f441943. 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/QZDA51862872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff50f7e9d68117f0bed44a0023912acf77ef948bb0ab5a470a583896cd9e1a29. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZDA51862874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58f07a971378cd7324830bede345d10d41ee6d894a2d916dc8360b4c6727e0c. 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/QZDA51862877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51475004f168b44c89c814f0382d21a14791435d1310f0fa17605b53e373a8c. 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/QZDA51862878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d59e69bb8b2a41ced383ab02fa60b34282ff22a8deb3acb7c319c480bbd8822. 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/CA5KR2092163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fbf1beb26fc64c9d709da791f53e9a073b9c341039143091b26ae13acc090b. 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/CA5KR2111231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8d192288121d921405ec4f4edea06ff603681de5fac6dc362ec6cbc1bd3792. 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/QZFZ62118916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bb0a4cd28e75490687d4aef1f5dcdf625b91c1b5b5e372d8a5043111cdc38a. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZFZ62118917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1dbdedac328cf4049d2d5d3efca682bc1b39e19cd8eedfe0b7fb2ed7486f6f. 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/QZK6M2145604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275005b8a36350694bc37bbf3cc9b875008b79e2906de618fac1ef9cd55e2a68. 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/QZS632107256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc367bc53a591d883539a4994e731b4659dfbd78d8d5a88b6f25c515d4414eebe. 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/GB2LD2110310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd423db8503af0f0641619333ff80ac3ea3d58a14e3feef57e7ab4be2cd95bcf3. 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/QZS642128271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb0c92dbbfca0be56a92064bdb8942e1f77d925c5e106eee6a987b5755df11c. 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/QZMHK2317964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b26f9c8e78b2de43243f67a07aa54e10e6cbd719eb5f88c4b2b1f6f71e281b. 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/QZMHK2372421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c14070c8f9300e70a688f44da3a6e8c92b52aba8eae706389ddcf345adb3f4c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZMHL2318692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41b415469dbbd7cc8ddb587118d2710e7f3536be657d505fe8794347a5960a6. 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/GBP4E1700381.