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 0xbb93f7484adf0a6703fc04ef671c8d0aee6eebc825d3ee3499a03dc6278e52b2. 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/3f8f4576-a26d-46bc-8f94-62f3cca209ae.json and https://artists.proofprofile.net/proofs/artist/3f8f4576-a26d-46bc-8f94-62f3cca209ae.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 0x9f07b23138d41e466ee2109b4e5f55dad81bd09aa1e0a88f7c5e579ed58026b8. 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/NLL150700450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e273d93cc48c7463efe495959a07c8a4964a5d458c323629cea0e7a025b14d. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/NLL150700452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7b68212c001959129b27b8c04d8e4842c70301f0a4ffa6c6c61ac389431da5. 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/NLL150700453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724af7fb400b61e18d04aaee170de466b48582c3b40cddb307fd46249efdbd68. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/NLL150700454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa255d55b424740e248a1370a7446ac80abebb5e843f793559235aa9bd0bf3e0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCABH1202235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ea50c5a060fe28c973df943fdb721be29118ca685dadfcd6b7de2780de72c9. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/NLL151301909.
Woorden Van Troost in Tijd Van Rouw En Verdriet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9ec6c58bf4571e391b581ae632ff2270e654098c1520931b6d47a275baa593. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/NLL150600322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbb21458733f6c645fd62fc5972295b31be297f56cc31d75ba9064f746f023b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NLL150500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a4d200ecee4718e40e7d98c0f64c81bb208f77f2f3a7541cbbbb53f3dcea73. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/NLL151702674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06eb0e10974eac75892bb4c14d5c19228d4e2de53afc8bebd4bb83b41436742c. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLL151702682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277f6430744821c3fc27f43cb406af1fced4bf11fd3eb51d9c0dc2f5a2d716a4. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/NLL151702684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba245934fa037f6f739b61e6348b3fa07c4dc53f88d5b7ac3e8e7ddc1227862. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/NLL151903087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e82e691621f24a3c11262cc4fd440274dd14b7f61d6fe7ddf543dfd41b431fa. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/TCAGR2280393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe483c6f649bbfb9290579de3ec863d536f0869ad6d481cf87106d5211f751faa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAIE2482124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd1bb875e9e36075fe6eece1c8faa2061458a7d986c405b472e55d2e3d22ee77. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCAIE2482131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6e80aacbb908848f9749ae904151f4db60a3b104f9a8e1f4153f85c666e36e. 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/TCAIE2482144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7d6d124b24ca135571243e96af6da98d6ecb06eea80424059834ddef3dd684. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NLL150600356.