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 0x3cb6648f8cf89c36f3c287cccc4e5299ed5b1754ad80552c25f798dafc8498c3. 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/7c5fcb58-3a51-4717-b00f-5135febd5814.json and https://artists.proofprofile.net/proofs/artist/7c5fcb58-3a51-4717-b00f-5135febd5814.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 0x54c40ace838d5b73fb51c65b29acc92a9c55bfd6f421d32b5cf32937315ddc6b. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZTB22250573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41bc1b5eb936e1467e222b5c053a086e82e84346b8d2d9ff1cfb1c04ecd5bf63. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFYX2351593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c40ace838d5b73fb51c65b29acc92a9c55bfd6f421d32b5cf32937315ddc6b. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZTB22250573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5277eb60742c83e41aee01761a890f0d47989a80ca7846e468a615bee7a3ce5. 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/QZFYX2351594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54bed18a754e8a1887d97f7e580b27235e55b73603dc0f67be6bdb4e67683ab. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QZFYX2351595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7422f711eff558d3ebd8d486f9edd1d2307869fe15a317ef53865b26a3a069c9. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZNWQ2351394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30cc8cc35b64d2b477a38092cdd110b78da77392d02f6bb6b923ffbe3ea21a8. 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/NOFYD2308152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d9b3f87b760a66e7e8d4bc015496996a262839fbefd85b76db0f8d3f303b89. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6F2240159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a47d5301248866336025d355c85eef4d7de277341b7184091fd319c452a5154. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWR2424362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2aa06dc6d8863a7b90144060af6bd6f821692ee8b9e7308bc1c5207e7b57af. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZES92262000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a579d2aa2085f2068dbe05202b951dbb8ce963dba864a5b807187b593ca4d98. 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/QZES92262002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d9cbeb3753de829a7fe2139bf7887ee70609fbad40d9a3bf0c564f76564b66. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES92262005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7ab5ffea3b6a010ba39c9b9845caaf4736b9b0b688277ebd4a3573da4213fc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6Q2383173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf982622e1dd52464961d4a60e3e216d9ae1e6c79027f635570359afe9f8fe4b. 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/QZDA72331232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0fea6c18ab2f827f8cf1013d3c2250b067e6171768eb436fc87a34ae3cdd8de. 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/QZDA72331233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a653d7ecf9d8e21894909c28927032e6e8da5bc4eb52639f051969dd451147. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA72331234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb2e616ba82faa647ccdf35623b4b9eefb315020ae1d15e464efeeaad84f09d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA72331235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701caecbca76bc9b7a6da0a32f9ff3ef79e2148e803c79fb45ae264518425fc7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA72331236.