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 0xdfbfdb47225e5730b18dde132a6db943bfebd152c1cd58936458f669bba6e210. 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/159fe55e-4ddb-4cbb-a103-f2b88f533895.json and https://artists.proofprofile.net/proofs/artist/159fe55e-4ddb-4cbb-a103-f2b88f533895.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 0x943f492e64b1b274e5c14145ff02ae9708dc25450f2facac5088f786919ef14f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BXSVC2300185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacb95af451de443749a6b689833bc8f6514be516eb40dcfc389c4f3f1800233. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BXSVC2300174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c780ecb22298e2feb5f7948c186489f97d7581244a06d632b0edd13a43b911. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/BXSVC2300175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fdfd785294bc0d8db704c85f8d42a6214dd6d08fa3b73314adeb36c6298c7e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/BXSVC2300176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635b674e9d627863dd08af5a59e0e8a7db4815c5b2e120815641fb5c2257e779. 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/BXSVC2300177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b88039cc0809a35cf0ad898049ba24c9f8c27cbd785e409ed8ef5c53332f61d. 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/BXSVC2300178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c5d9917dae70a49ff93f1e9a31abffd9d0646db70b3fe4a9fcb818ca722871. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BXSVC2300179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf842f058c574a2296159f9a421be4ddfe2f8e207d6fd34dbeb83b13a746cc160. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/BXSVC2300180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded3c1ebe998ffc827b1d7241682af1e71fbc971d33ba45cce19713b04179cc5. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/BXSVC2300182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b5cdd231ede68624b3a1e5f786bb4d09ce1e3518668e1dfbb38b4e84991dc2. 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/BXSVC2300183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943f492e64b1b274e5c14145ff02ae9708dc25450f2facac5088f786919ef14f. 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/BXSVC2300185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dddccf9b2c162e704b1ef1cee1f63b2d7312383cd6f64958fbc92b57bbb2c62. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXSVC2300186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2c024c9ed621e5744722aa519c1934c618133416c44edb8647764b6627fd2e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXSVC2300187.
Cantos Populares do Brasil de Elsie Houston
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07001a525eb1b4e96da55de66a60c6b2c1efccdd3ee2dae6465c6e162cd82487. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BXRNA1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f4ce21f8c68250d8297a09e3ceab9fc824b7fdaae805f26bb159da316d43ed. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/BXRNA1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6db99641aba460bc3570cfb42a3b3ac4462f5af1b56ca77c886c432ceaed14. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BRX6F1900045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fb2f0558dfe385f644be2eaa75809a16860ae797c92dc93d8dd8a75f86be2b. 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/BXSVC1902801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057e677c48f594c5939760dd9016174fff77b697eb346490918abae340c8a178. 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/BXSVC1902802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eab2c2fc4e2a4b330862ae6380e62d49167916e50925efd6828b4d60a8df05b. 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/BXSVC1902805.