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 0x49bb4f087ff11b8f9526e68d97817b2b788c0e23dd56f36d616f6585124d0f12. 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/ad57a4ab-6584-45c6-8850-5bf4b10bbd75.json and https://artists.proofprofile.net/proofs/artist/ad57a4ab-6584-45c6-8850-5bf4b10bbd75.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 0xe0e67f59b400d325e33092912c22a200a4e8cd17a0dc9d87a022ed74f6b8a4e8. 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/ZA3CD1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c77c6e6b0475f0e17f3321fc62797dd4779fbac14d0852d102374714a5f4ee2. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/ZA3CD1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae99b9bb42fd5e2561b86bbb712ca73969bc9141e4051d1f52abf9f00326e43. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/ZA3CD1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e38712f4b70187c08255b11dab1d6b1b3a1165c3936485a23034484ea1333b. 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/ZA3CD1800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6896dc4d77b32866347a05dbf8b85a484d9fc6b3e83732c74e4c564b8f44ab. 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/ZA3CD1800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435b4fa79ab622a3ad619a9abebab2c3dc76b150cda5c5bd16a579cd94f67153. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZNWR2434239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437dd94c511d2147e8e6e0034811495111749cff9b9e479ee17ef3abdc9fd873. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7L2578702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf61db1e1b15321afbf1fc65b805b386ac3d356dfa3d1e8e6c052704ca31f610. 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/QZZ7L2578703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac76d303408fbc1ea5ef912f5806f952b6d3df8e6bd49a15ffaa13456f5f76b. 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/QZZ7L2578704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e806caf310b36324df5d53ebe6a98f348fa0396e4795ce88b549031ad4f10d6. 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/QZZ7L2578705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a4fbbaf65262c26b69b34463d18344d1aecbca287aa907f9d74e167c74edd7. 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/QZZ7L2578706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f0262d8137c9a677da5937e69eb90f27212fabed749e6f2c1ca2789728b7d3. 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/QZZ7L2578707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9db3832cda2058ab8da4bcd42147d7aa821b602119bf49095dd9a733ed2c4b. 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/QZZ7L2578708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e3e58ed86aaa6e00d43007c06f6e54da759371cdc84b17cd73dec3a4d229e1. 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/QZZ7L2578709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e2ca82b3d08505c0e07c5896b539ba47f1cdaf3485b611396e286f9b35395a. 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/QZZ7L2578710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfaea56800a641c732628fbb5c7383ae95f733300da81c486fec9627a04a6ad2. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZZ7L2578711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570cd9f3b73e85746346cca2b4141533202aec9fb762fb62fdc366e2e36beea6. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZZ7L2578712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bebecf957dd8ea7223b969c5b2bd41f603e0830fe2dc36b54f05b6f525dab1b. 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/QZZ7L2578713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6416fbd159af25d8100201c3bf3dbaccece1b3f080cbb81d92b9758b3685ed. 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/QZZ7L2578714.