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 0x3936ca21a327be46e756361a68b8f8611f2ad4e9f2c2d23ac35fbe008ccad857. 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/0feada9e-6748-44d8-94ac-6dc49c50e3e5.json and https://artists.proofprofile.net/proofs/artist/0feada9e-6748-44d8-94ac-6dc49c50e3e5.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 0x88a72ba8cd52d978d7c16be53e868deb4fdc4d3115f2cc0f02901ff6beabdb77. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/TCJPJ1988931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042fc273efdb4493b4a1f34dde578166be9534e8cc373409d3c25b2511945fbf. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/TCJPK2099711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042fc273efdb4493b4a1f34dde578166be9534e8cc373409d3c25b2511945fbf. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/TCJPK2099711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b82b337a730c327762903361d8b8c5f44921675a41ae39f9c66034ab6853e59. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TCJPK2099719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4756e30ab489d58f4db647d78fa88724074d733eeccc7d9fe9c04643432e83. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:17:05Z), 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/TCJPN2172715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304a57cf4135b9cc4716888801cae317c34c77826e71db6590b37b05644ce16c. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:35:27Z), 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/TCJPN2172713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd789f95c394eb4e1f8f9094c67230eaccacf9f9363b21815583935ee96b01c2. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCJPS2231382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef50c645dbd16391d9d37758a46ceaad628f0f0618a4b86254837d943f7b3b5. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T03:56:59Z), 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/TCJPS2231383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a31e7974f0249a5d9937d5beacb9871fae1d1799adec4703b32cbaac30d3f1. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCJPW2335252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a31e7974f0249a5d9937d5beacb9871fae1d1799adec4703b32cbaac30d3f1. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCJPW2335252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903439f7bc6e6572c4aea004d1b70e120420284b23d5f15bd79525b4f56a395e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:59:42Z), 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/TCJPW2335253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb78f188b5a6178f02a4b5cb53278cba6a532b65d4ddf1e34c70a3018558370. 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/TCJPW2335255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6607a2a45801528e5641616debecff796f94d2ec5b09be0dd2843259ddcac03. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:54:54Z), 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/TCJPW2335256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070458049fcb50345cb15fe1904008d6865992722bda1d3eaf31b37bc8fedc73. 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/TCJPW2335257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbaaa4a8a7a42441dff3ed634b6caa76ba97646f1f6009a0b670e2464c51d53b. 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/TCJPW2335260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff70f275ef5ef15bf9dc27061d0136ad2b92c7f8db81a5dc1597bfe7e2cc5407. 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/TCJPY2303308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea41feac1f68904513f961746e213c585d7d9e0d163926ff9672b4f07a8360e. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/TCJPZ2448495.