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 0x85ffb014e14dc1956f7393957dd5153a720b229e6489a2bd07a9aca19233f0e0. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3afa0daa-a825-4655-b027-30c32aa45987.json and https://artists.proofprofile.net/proofs/artist/3afa0daa-a825-4655-b027-30c32aa45987.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 0x1afdc5393530cd5e93c1d4ab006d69ba5b88d5194909c793a17eae68d3833ac6. 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/US83Z2226990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19f45f7da00a061d66c64be490657f3e850acfea527fbaa3a67c744e2336620. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/US83Z2226991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba93269ecfe9a4e40af09c51e0d004a0a8cbfaeb15caaf9705d674292dfe1bd. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/US83Z2226992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cebccfdfc659dd10dc5145edab773f5ab03c87cd613fd4860affc298b678d6. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/US83Z2226993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa81ccbe8bf6a660f1bf16ca8e8c352161464b492b2a826b729d4bd0f093592. 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/CA5KR2214436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7db53782ce32a5d03594bd997dbf694579dbef184822f738d5216e8b90c9ca. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CA5KR0005544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b646009e30a5cbd46891d8213781b70b5d2f9e3ea90895bc2dd8c0d47441375. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/CA5KR0005545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4551169b96bf4bc2958d2d73c52b59f7694c2132300572202d3e5f7141216484. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/UKR6V2176420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499a2104824d14a1706c2428f786995f2feb896394ff7ed0a750623c41fbbf60. 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/GBKQU2176497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a7cb91decf0842f5c7e6caf4e1bae7d1bef8719fca6dcb991df4a665b1df03. 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/GBKQU2176498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf974dff722d23d0944e1c79499e8acd1de3556f9ab300f5b8c9bc43f59f4c52. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/UKR6V2172506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6963156587f4b4e17bf22b5672fd738747313292833c7c8ad10d808d29cd25. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/UKR6V2172507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacde6cebc402ebc7fd955e3096505669ce67cb145f72011451d948016e8eb69. 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/NLUP62100155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42cc2c28211d6f6acd4d08faf722c7fee26318f183bb6018fc85c165a8a8f39. 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/UKR6V2193093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d8b28f32d1f47bc6be5ab3c865acc69e9a53bc888e8f6412ec16b7ca751a8d. 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/UKR6V2193094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60c5ea3e67affcf6a2acbd42ba923e867203eee6018eb654250c6025e8a4dfd. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/UKR6V2193095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4134af3e9dd1281f7a8bb772cf6f0d8d05e60b3f440c28942fb87b879f8d6a7. 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/GBLV62011127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c7cce2fd3c923f251ee4e4b5e774810f580728d6432a09566beb7a5009cfaf. 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/GBWUL2086112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d8a43d67eb579e1b66142e4764ccc851ee9f22a5e38f3bd378d26368d179a3. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBWUL1804279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6dc5c1da2ca16fb6d601c68060cb85ac86a46435fd5d022c7832024cf58027. 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/USLZJ1789294.