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 0x705688075191a423a55b788760aa85dd842f57d1a5bee0f4502accfbafd94b91. 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/224abd82-2d93-41f1-a66f-6c1790d2fd62.json and https://artists.proofprofile.net/proofs/artist/224abd82-2d93-41f1-a66f-6c1790d2fd62.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 0x1d314d2452cdb4447db24039218634eafafb3515a5dbe577d1ce8a267eb2eedb. 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/ITND92000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d78fd79d52a5cc2158122f14f2c71aff4d6c9acdffc40fb0afe0b567ea6693. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ITND92000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c0cbc8537175bcbf3434a24f9cb409b1d928a57429121136a5b0a687aca23c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITY6R2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bc26d7fe0644aadec7678546ee8c61ab0b97e53ece9ef7d70a1a8ddb5f1633. 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/ITY6R2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3037211dca71ca76122fe8084f2b83a4ebe33e13bf489bc1d345c610f5f24b61. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ITY6R2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89388fb950f77ea25ee0bf16816663e22b9ee0a42ccbe56967686aef23c16010. 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/ITY6R2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea29158e5ea76ee93f30fb596fffa71f4a6fe13ba28fb09ec9ee0614a3811e9b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ITY6R2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d65c9468d16638645745e1992065b083ae8c834c5f24510d19487dc98a946b4. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ITY6R2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ffd3c90823d82310108ca9b077c45af41f2ed38c76887aea1e4b459d831889. 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/FR2X42380668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064224ccadf0aa503449f229caa63b383d250b62944b74b3404412b14bbd1deb. 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/ITY6R2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b695a2494008f049967296311434a2181a67cc3b51ee0c401ad2b2699d5282. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ITY6R2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0fdc3d32b48ab41578088945679a20207028f678fed796415615c2359ff3cb. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITY6R2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54a4d79a633f6ab74b8750fa23265da75cbbd8ba8469df7e847a512dbdf959e. 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/QZK6P1964596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac1ccf49ca14a9042576440a60c6a1f3772848dce5e7b7a4733a6a3b44f9044. 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/FR96X1961620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca38f7609a7dc46baab3558e0313f1528136fa3f18d4e62d8096f2bcb1b0838. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCABR1303790.