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 0xdf4d69474630a562316864aed405461dd4142fce7b5f8200fce4cf2ae6c7364e. 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/f851c3f7-d830-4c1c-9012-b3451efb6bbe.json and https://artists.proofprofile.net/proofs/artist/f851c3f7-d830-4c1c-9012-b3451efb6bbe.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 0xdbdbaa1910aa72558c89288accf94bea2c61313a5817becc0c5cb9c613a4ff27. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USHM91902157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8a24bfad8a26487f16d99c51269d2326f580d77ff1517b7e9c05172122cff8. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USHM91902160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1af31389ca9a870d712229a98f0c9a999da1b078c613e49c0b91ab9d377870. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USHM91902163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3a4bc52c9ecd4e4f95b3f592b80ae6cff91bf0e9a9de15f016d45bf89647b2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM92253564.
When Did You Last Look off into the Distance?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3852b4f192e2a076354f70e3941b130c411976a9b333f3bd743b50d5603899a. 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/USHM92253585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbb598071f57b1b51b9981d36ba2681042d9a3bba453d26c53ca04627ff6a81. 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/USCGH2332243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7a22b455309b82e3b3a37639976dc59482d80da055233aa39e182e1488ce0c. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USCGH2332244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9212f247ddac89b38aac2e6a0ba18439facb9dcce3829916504f27af4cae8b47. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USCGH2332249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb6bd84262e280d2cd854e5432a0590f5abde1a259161bb3e798840dd58a7c7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USCGH2332253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25aa33680c67bd832f8dd435badc677eb32319cceaf8de8f0a18339a853430c6. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/USCGH2332254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb585e83851f03366a05b49f91681e64bb1a0cd6a8050845892e7986d61bc95. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/USCGH2332256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3214acbd881679b9fde5fee75d7c3fd2b77625668918096c859cff32008596eb. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USCGH2332259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe4e87ab8c029dc60b6bb8e6bec7cc54e1ff9e995c0231838aa02bea2aa30b3. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USCGH2332263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc8bf59294dabd3655f0154af5aa4869bdc3b7a529eb069aae2611eeed86230. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USL4Q2312708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f7dcef7a90a7f46f76892937c5a94f120243aa4cdccda3685980c016222d78. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USL4Q2312717.