upright=1.35|thumb|Pirmin (ca. 700–753) at Murbach Abbey __NOTOC__ Year 753 (DCCLIII) was a common year starting on Monday of the Julian calendar. The denomination 753 for this year has been used sinc
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 0x246d8fe25d393aeaddd83f77bbf56e7e6424d31ee831963ded73c820026be54c. 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/edba16be-c69c-4f4b-87fa-a933e9d73b52.json and https://artists.proofprofile.net/proofs/artist/edba16be-c69c-4f4b-87fa-a933e9d73b52.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 0x1f2e550d932e24f42c5afd1986ee2dbdf96b86be53ddcd1c6000d038e0fcc8b9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZK6M2045392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2dfb850365d833bf6d738b2f816ec7d64a1d3a8df325e64ee859774fc7edf8. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZK6M2045393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc06119eddc42b72107f04158bcb97f7c3b064fd73c03ab8cfb24828c7aa06c. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZK6M2045394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40846cf646e42ce5701063c1fcd32467c723080f1bb857e9d9afcc8adc318b85. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZK6M2045395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x694e0314e80b82d9cf2b53c0f912f9ed181727a4116893494b2abc37e2b3921e. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/CA5KR2151837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1ec1cb536a2b499d8796e3f987ca18f0c1b8207afa8e7fa41e3be7244b8999. 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/CA5KR0004598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73d65570d7c441fd961435bed9514e81217bd011bad170a951aa47e2e7aef9d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CA5KR0004599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f870f871c0f9c0c0081cbd2081aa43ce4fd03c9b570299a948bc9793aacbc3. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CA5KR0004600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94e10c1e85258ccfbb12f2e2bf7f754e61ec14f03b996b94082142f524b0917. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/NL2QC2100619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bf03230c3ace3d78a17695be650dd026707086003259d6722512579fc3593f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NL2QC2100620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033311a7a6a7bfeb73dec3cc373083a9c2e998e5c715171db6b6d389f24ddbf5. 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/NL2QC2100622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475076bd0fb5e903d9c3042d2f78bb2408a22eeaacbb3c3a58e9db617d751f05. 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/QZNWQ2310679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735d74f91d3ced0d440b7b479c44b5efb98a11019f0c9e4ff0452fbe1dd6360a. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZRP52420425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f59d7e2ea2e80f84ca83545c4794110da72508edb958bdb146cff8e7090cea. 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/CA5KR2125668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b586da8943b565c8ec6e5342d043c9ac77ca1e927cd767ff1dfe78791561726. 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/NLCK41094182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbb93d139bc476a5064798c74a9786c3a6519aa208450541556ed5d0dc0891f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLCK41096470.