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 0x7997edea9972c7d205373bc298be2180b8caf252455e83f024f5db7ce73fe2b5. 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/b7f7b4ad-1c69-48d3-ba15-d7e0ee756df6.json and https://artists.proofprofile.net/proofs/artist/b7f7b4ad-1c69-48d3-ba15-d7e0ee756df6.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 0xbf662ed69ef6928ad6bf4fbcd5c800f81ddbf646d87cbba4452d8eeb864a44f9. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/USPR90250209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9988dc63ccc343d271b542884403883c41e41dcb7f4caaf9d77a6d97de4ea4c. 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/USPR90851401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0641c5db521a8b76e63a74416fa132b149322b622a5201ffa5dd8727f07c9123. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USPR90851402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62c808c751448efc465486ad9f9af701a4bcea0ba4250eb9ac40049991d27b4. 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/USPR90851403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb975946f7d53e77ef8bbbd9f7e3e85db7eb443443db3b39e8af1915002463c25. 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/USPR90851404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095ee21df056310965d8675cb003b41304f7956c5b3c24d19ea09a5e20464f8c. 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/USPR90851405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd1382b13a193bb5203c67513adf899ac391614bf6de1817251fd6516b23262. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USPR90851406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78aa9aabf90f24c5e89ee3359bc0433a9afb495c53ba5ebd1e0dbecb43f28fb4. 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/USPR90851407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb24d6786283da79d39ff9187760468702f6a61925e485d0607bec580d65848. 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/USPR90851408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654187785ffa7db8a9e491d7306544d5f8b00aaa4ee5306ea48ba8242ef389cf. 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/USPR90851409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30143b29cba6793bda9dc4ab0954d79133f9017a1e29048d7a2a57ef64185469. 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/USPR90851410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702d1ee3807891195f92906adecdafc590031d88af9846619d53fd436ea8aa8c. 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/USPR90851411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3fda578cd9b0107266a5ff4affa943826a1c8c534fd4f7f7b3023036769825. 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/USETB1600492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0b0500aa2c9234569b70facd3e1632ca35e2f4b282232ef1617fac450e915d. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/USETB1600495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68920f721e1f7da241eef79ef92b524cdbf3fb46b35bbb3833818abef42bf6ad. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/USETB1600500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd1382b13a193bb5203c67513adf899ac391614bf6de1817251fd6516b23262. 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/USPR90851406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba4c67132cdbb0bd7761aaad3bea9f2d71be9ab1bf36c6bf07fc9a4620eba5b. 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/USA560515796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28832135c2ac234d53694fa4fd9b14b4251cfe7845daab40f9e7502e54ba91da. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/USA560515803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6e6784755202c537cc2d5d3b73deb19ab9365547e805fd494720757cffb6df. 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/USA560516240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6f271288db155bbfb040d887d282a3185df6095a254dcefcc2fca07b3fb45d. 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/USA560516241.