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 0x0d0cbd8e9782e789f46bafe6e9f9e4ab1076e67f878411a1fb24a38b1fb409ed. 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/19882ad3-9c41-45ea-b29e-1321b310eb53.json and https://artists.proofprofile.net/proofs/artist/19882ad3-9c41-45ea-b29e-1321b310eb53.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 0x696480b1b9f595a342593af351376405358a737e7e064391dd683feffda18796. 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/TCAEG1978816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5e447bd67745f18b4a1c0bb1bfb0d185742f94d6741eec37ef1f12bd39faf0. 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/TCAEK1954027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed31bbacb429c472e17ac56b9cc4663faa60e5bbc555b076afc3c05d74fdad75. 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/FRUM72000589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c7d7df92507e3321f5ddd283c33e81a0947eaec225f35131c2e52cc41cf3cc. 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/FRUM72101783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0d9be68e6c57125665e3a6f8ca3c84f6c475eb81a84b822e195dea3e120270. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/FRUM72200230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfa4ab59e6f6af22924b091bf37206cd0f381d62f0b51bfd74b88fd57a94797. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/FRUM72200228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37507f2b6667dc200eacc866af4519de4028082b641192dc05257943c122d9d. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/FRUM72200238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acc4a26cc074bb3dfb296843b9760f24105a7acdc2bfa6a400bb980a6c2dabc. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/FRUM72000881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa243badad10c0eec4b4134e0477ffc7e251168625489e56446132a3d5d7414a8. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/FRUM72400186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276cb573704d122ba9a45c4bce51eb9c4f2d0100ba805dabed189f0c624761e4. 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/FRUM72202770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091213b287f88cc1b513743549f115f5c3e15efb002441571f0d00ed9578f975. 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/FRUM72400423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2787b4a18df671747bb3b6dbc1d165a5e8a8de36b68c267f151e6f92166aebe0. 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/FRUM72202771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cde89641d175031920b818fc622d1bc00195a1ab5c93d1f38dcb7493ba4cad. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/FRUM72400425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbcab9a04af9a99ffc3bdd5fae8ffb76ca50ed74b2083e5f037501a13a8c99f. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/FRUM72202772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf685fe6f7e645669a5330c5adf6ceb6caff652ccf3031a7fc05881864c9854ed. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR7X62400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c7d7df92507e3321f5ddd283c33e81a0947eaec225f35131c2e52cc41cf3cc. 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/FRUM72101783.