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 0x1f8593d81f54d92fe0cc73a5aaf048660f2d31632e18b2b234f16b0126491d27. 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/42541c4b-d7e6-4a2d-981f-5f67b03d805a.json and https://artists.proofprofile.net/proofs/artist/42541c4b-d7e6-4a2d-981f-5f67b03d805a.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 0x9e4fdcb91f3cdbb9c3df7442b7fe7632c3493706d5abe39b02681bf367122e7b. 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/USA2B1801749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce2c0130e0d1b09d25da0419f8a1565399a0545d0a00782dc7847326c9c020d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA2B2057288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005f6b78e0d24c5a571839118da20885f00fa08a705547630f07768c5733cda1. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/USA2B1901052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae8d10d2dde38f102bae121531dbb77fe79c9fa7540e77eadea3972dd4c949d. 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/USA2B2056075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032af1a4dc360b7aca14b65f4fa30b16ae467a84efb3b7b359a46792c6f14f55. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USA2B1803780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb1d4deef78ce9097976bb6068a308173e839bd71e4d5fad98a96f24ce66147. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/USA2B1902685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0812fd7c2a1159e6f0bc31bf7a79df64eeecd9cae7f2d3815a2c50ca7c438889. 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/USA2B2104017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7e90d6b6560bec1c60a3ca6fac6f72a82263602582f989c549afca287a859e. 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/USA2B2208454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc2b0bc324f46a275f144d8f9561a3e6d23580799a68dde2bf61ba4a8481896. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USA2B2319586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf601285eb1e0fa3346fc8fa39bfeb4c0a3ce69df798123e6b3f8ee7f2e9648be. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USA2B2319583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d2acd5f081f2eefeccc7e27a3490b5760178577ec7fcac0c396c4a4c74de0d. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/USA2B2315765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc2b0bc324f46a275f144d8f9561a3e6d23580799a68dde2bf61ba4a8481896. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USA2B2319586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07117d4151614fe8b4f8f537604acb5c37a9eee80578684db0e0be381d47f536. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/USA2B2201872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c480e404f1098412fc2ba0c7f32ac0f778a232a02d12af7ba5b6f75c9ea9c6b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USA2B2201078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3630b475d3aff37df3b61d6d13c8856187416f4fa4984dcda68086b59b685681. 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/DED832100949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3630b475d3aff37df3b61d6d13c8856187416f4fa4984dcda68086b59b685681. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DED832100949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38af4b7126c0b712237225550a0af2a80fa2a2b13d0f426d4c051fd54184f635. 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/DEUM72411473.