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 0x8eb15b6ea6fb85bd7561687e2f241614480ab9539c7909f1775adc3c7f0aca73. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8eebb54a-47a5-49f4-862b-77eb6dcef9ca.json and https://artists.proofprofile.net/proofs/artist/8eebb54a-47a5-49f4-862b-77eb6dcef9ca.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 0x3f11423f7e2461f3bf83b25e4c8b14dbb5176e2129010ef997e27e68f634e168. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/HUB191300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6993360b4afe5949cf8f5f1641395c37b8915b3920b547fcddb23696cff76120. 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/HUB191700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82aef27ab7fca5be9cd7968b4dcd7524a146b8c55afe5e766e408d451b85fe16. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/HUB191900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216802161306be645a1a1156d730dffad6ae797b4e0ababe9f49c0519bdfcb7d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/HUB191900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8407d34f5855c01ffc1b55fc9d3918426c8e1bbfcc2a981f8acd499b327441e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HUB192200401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54be1b62067b85486a3398da8700c16a532dfcdde49c346d1d261f5831320f8d. 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/HUB192200402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2722e4794c6526acc2ce0d7337637cebd827780dcf5ec88377d1e0c2ac3e7a. 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/HUB192200403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5605bd73b274a629449fc99f6a892681fa16000ca2f05e6fce6e5cde0a4f36. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HUB192200404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07666ff0e57d9cd4de593ebd4d442c3f4679596a7f915429c216cb26bcd18db. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/HUB192200405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a746a16fecf3d2610aa15af2c3022c9b99d7907523aea64f95088a4938fc0ef. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HUB192200406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe500ce64888eb3720b93653826eb40b4d6bcbdeca403ec18d00f7adfe4a0b32b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HUB192200407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef3401a1ae7445f26708287490dcde9350b3ca6780101991a321da2938b74c1. 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/HUB192200408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ee490a31aaca222e31819ea7604a4be067759f9f59cf32ae6cfd2884282933. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HUB192200409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0170736e0fd32e12d2a7ba15d9940e32e621e9ad1722caaa0f4ef094e9691012. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/HUB192400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa396ecb5c0f5bde42953dc7182accc97cff634ade7f2c616d7ea6aa8b890183c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/HUB192400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0186ff0ebfd40f1de690dd21735437186cf871967609ee222c9b7177988c0c. 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/HUB192400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614b48a5ae712602bd5ad02888c046a801283874d05ba0b8e476a5108e69a061. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/HUB192400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f1747f2e3526c59f4b2d8fc0df12d2020ab93327cf5712cf4c8ff52c682275. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HUB192400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9828084d3dde97845de40ff9685effccb0a3d175a840260c88524474177c586. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/HUB192400011.