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 0x12867a7e760b61b4218f2f85be16884a047eb9032e62a50c0ec860cc51d6963c. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d67d5db-d40e-41d3-acef-f1b6a891549c.json and https://artists.proofprofile.net/proofs/artist/3d67d5db-d40e-41d3-acef-f1b6a891549c.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 0x6cd20a6cf6bb0c21df415d580c5d618c3f441304dfdf85882f3571f27dbc3151. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCAHG2383615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bd9f582c4d7178309d62b5a3fd90deb9b81a3f5d4a5d1e7ba22cf94d768985. 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/TCAHG2383616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95503f19fe68e79912e6d5081fe49fb75097cab3b5454b5457184d63496d55e4. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAHG2383620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f2dd08b5189250d76565aa56c668cc7633cf76b0b08f318630a7051917dcc3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAHG2383621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0662886b41dba47238a981f768a7155efbfef27b72a2adba8081cf02373ea1b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAHG2383631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896ae1a488ea10013734f0b8147ef32a67237c8e944310eb8318486545742abe. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCAHG2383632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d01c411e282cfdcdc1d9b453fe497252ba961417d6b879ee4d8de937f90f1ec. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAHG2383636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a6c577d7995cb4952aeeb1d8834044a7c3386a38ebf4f7cb56b3ea1f35944a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAHG2383639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05078209712155bb059cb21353043a79ce0ce1f7b89746a3176f8e0c5d805fc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAHG2383640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744d33307b8d5fce748c71377a66d2629920f771bbb1e03c138224c43ffdcced. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCAHG2383642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a40c71d1922388fa16fc684bd5da8114e96459a2001c2855ee8de06cf4816d. 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/TCAHO2396847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec508d30ecab40e813029935dacf3ae83e8ae4ce356a7c9999d50c525ab3d2f. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/TCAHO2396852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fef1add657f65e0bd5baa53ded9acd0de51679e89e347008e3303512ef12c35. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAHO2396855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd99be25e28dc670d43d503fb6a6a592d108081418572fb700f4fa9b1add6a71. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAHO2396860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ce04824bf3bbd4bf8374c7c2d17eb6be86b49739612589d9fd1ceaa73cd436. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCAHO2396870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b943e41de76dc95441f405c73b4c6b0f93acf306d178e684d4d6a863e0c524. 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/TCAHO2396873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a17b9cf27734678d4a55ecedd7a3d4dd5b9fa2038b3673b9724f2cdcfb2c3f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAHO2396874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f418b307ea0db6ad4a7a266524b325b780949955355b8eaf48df4c6a5f6929. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TCAHO2396880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca250bcc04d4d26f03ffea114981da085bc5b3037c9b4ebcfad0faea254a1603. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAHO2396884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b9368ca59130bd205cd06b7b15544a19b3a1850ddef0fe771f3445a58d54c3. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/TCAHO2396890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4dae8ff5ff1baebb1f840552dd0bdbe6609d8b89678e3486282479e2b2af696. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/TCAHO2396893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9666e0e79a024199a554cbae78d25ae737ffb2d663777fdd5c65e72ca177af. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/TCAHO2396896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbcd777355018793fed0f1d94727d7f3317f8b48284e3b9ee6f36704e00970e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAHO2396898.