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 0x45c2269aacfd26aed7db275c83b4c9fa17e2c9a9274dc4bb87c37dc32a7cc107. 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/29d8b093-e8f3-417a-8463-9932de79b7d5.json and https://artists.proofprofile.net/proofs/artist/29d8b093-e8f3-417a-8463-9932de79b7d5.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 0xa71e991b93868905378e08a49d37d8cf458ea54247851e45b10eefe9fb097d00. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCADT1865422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87041166ceede8ba8a54155a98f55bfa16da1a9b1f381a2d4da9ba33a4ae6c67. 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/TCADT1865425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa960adca5614ed4f508866da520a28ca740b69896fbb550db8eb6bc579dcfe1a. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCADT1865428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f631a8e66e74ee9a51134cf2d2822c10651e19fe4ba19f7cc31b07de7d96c0. 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/TCADT1865433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2eb3a6a6197f82dc671fcf1eab59959572b366d4949134d10f0ef1ee21449f. 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/TCADT1865509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3d49190782c13c5fb2700362a9227aebb1e8983a70876c64c03fdc9d9aa697. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCADT1865510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0edca1b561243b1dd3eaad1f97f8526345ea0a8ba552f0f67673f90136b681a7. 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/TCADT1865512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014b8a3688d84f26ce80340a28980d57d727f40ba028d0552b840d8748b2c72a. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCADT1865514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83ed47903f2df3b1886692f6fd1dea75da46424785e2681435a123bb39e5ca1. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCADT1865542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1103fcc3bc458d97a5cdb85711fe494c49e5d3478b51d5a07e03c9358bddf67b. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCADT1865544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e01c43269234f989351b9310f5436be979397ba612d73d3237789216119e78. 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/TCADT1865573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93f537f5c516fbb2fdf4d0581513bc9780ed42b5e1492957eac5f556a3b05ba. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/TCADT1865574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc94902fb8cd096fb0b7143b49a1897231f14c1d460777c8414ea7c93687ade2. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/TCADT1865575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c5dc4a1e2bbb2b43d537a1f6dff6aebc6d3bc8cad844509f390b5999ac0a86. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/TCADT1865578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd08801c165a7aa76b99cfcb85246f052a899e8e53810e97e2cbe6713486ecbb. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/TCADT1865579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553c6f1c1a240c79aa813b07c7e55fe25e821ad170e2d3ccaa288100ff228c6f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCADT1865591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fafef7854ea53cff78527558879539d9c67d5c56b0c561599e35a0ba6832675. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCADT1865592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664dbfe91d6cf04161d8d23805e6924652c20d71242a9d4a965337695023e618. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/TCADT1865593.