alt=A 17th century painting of various objects, the most prominent of which is a human skull.|thumb|The human skull is used universally as a symbol of death.thumb|alt=Three objects on a slab |A flower
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 0x9740e5f5a4baf6f3ce3a6fb9e573a6d562978c7e579ad290ec668596906eaaf1. 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/603ebefa-cb88-4068-8b33-1550a106271b.json and https://artists.proofprofile.net/proofs/artist/603ebefa-cb88-4068-8b33-1550a106271b.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 0x6821733d5f2d6e1c75a40b393759067ad35cc483515a0076e48bfe94af354cd6. 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/NLA329501670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74379dacb6ef038e5f6797ddc06ef97823c772d78a6734054c96dd68a75b9ed. 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/NLA329501680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b10c0338d535d7e6dbe30f901c2d720a9da553bf59e6929faca916c83f0d086. 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/NLA329501690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9749c5e7d5a5d5e134b7a8e5e0e355bb2e6bad13431fad3c0fa1a4af79b4b63f. 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/NLA329501700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664d9dbb9c520b7ff59134dd3436af842d95bac479511abe6cf398ab4895c6c1. 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/NLA329501720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c31629fc912cafa3437a61730bb072380ce11d18a90c75d81dd22da3ed08d8a. 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/US2641005301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a519eebfdce9529d921bb992db24ef34ae95099e8056d3d7a79c3472ca928a. 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/US2641005302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c10cd92ef7524382ed1aed37687559d54c28aeebbb19da99342a3271f80577e. 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/US2641005304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99bb7db0b78c0e9ed1318e177293befb2f6e3d13696ec13243d810ff4eacca09. 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/US2641005306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202f9e456c3cee4e333f17ba16cfcb56391b5bd493d2e0a10051f642f1a50b22. 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/US2641020001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700b7054c7d6ef88a7105aabbe3a3bf70d2ea914ff28eb9e278052ba90f32ae0. 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/US2641020002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8244126c8f6dcaf7617df9e42d18718c12c7a1104faa01235cfef835068c285e. 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/US2641020005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe745fc387ccd2e0266d91cfb3ed5b4f203942e239697826407db880d2c6657f. 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/US2641020006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c4be564f2e4be4cf6aeb014b40548f2b7439373fdb2e8d1ed1866e5b9146e8. 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/US2641020007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65724b4ca113d4dc176c92bfd64dec7834da1479536be947af1ff5dcbc2639e9. 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/US2641020008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdd18834bc98c7b6efb2f9bbba3db988ed859a4c10bebed1ef44fffbe4de773. 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/US2641020010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b9785cad2ae602eaf8ef6a4b4452b5ae415c86958d3cdb68b53e8f2828051c. 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/US2641117103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e947c5b1e31f566504164dfca5fff3f380a5d16f918ede49c3d511093ba19fe. 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/US2641117104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dba78436ec6529976b5edf85283d1876ed0687987730cec09bcab91302fb1ce. 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/US2641117105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e79a0d6699cfbdc7feb89dccdc3b16f9db1d0f9de48537765e6f2655a6f203. 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/US2641299902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73339e9416565aaccd76155841765b4036eddb23bdf4766eac6d801c1083f5f7. 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/US2641220005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c09acdaea97308491fd63675e2984d02d986caac6b7d5d46efd479fefcac32. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US2641115401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d9062fac8d369089a61432088021857ac637cb7f22fced88d4028705249e94. 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/US2641115402.