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 0x181c898e49c01d229b730158ceefbcda319c7a080a46da86112435fa35d0768b. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8bcbcb15-9616-43e8-abe9-8e7011cab7b0.json and https://artists.proofprofile.net/proofs/artist/8bcbcb15-9616-43e8-abe9-8e7011cab7b0.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 0x8ce5b46cecb19f78094145f7a9bdd328eb6bd0d303f34c57b37344729feb0e53. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/NLFF90800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850b33109c2bdb8cc816452f59e9b38f932e4feccea63a5716299a4545e9a64d. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/NLFF90800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96bb8d64de3f7568283a5cf08055d7389a740d3d9dc2bed4b9afae9925f15f6. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/NLFF90800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd330edf76db85a65da7f58419f6131bb5c1c342cf641e9bb05199dd96817c9f0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLFF90800029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3023b4151fa1478627ed213b7f769890b339603cd4ccc8adc31f9d7259341964. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLFF90800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cff73e0d0db23629c948977efe7b8780c85e2d7cf18d385499957759647500. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/NLFF90800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bf998a50a16ac4f0aec816f387f0fbc1456689ac35c91416f82e8eb99a5726. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLFF90800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f5f64c8a57412a38899bdb265a6a8baaf6f4d1253b1fb305e78c8db6d9a824. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/NLFF90800034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff55ecba44c70f45d00d0c89ddbc5dde4b256c818937dbf11843dbcca0a42cfe. 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/NLFF90800035.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc77baa882850871c34858c42bf7a0ed966839afd066566b95155b8097bd1e2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLFF90800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f06beb534ab68ea8cb3d926c7640f9f570bee105b95a605268522f6645269c1. 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/NLFF90800039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd835f10083358f0fdf079811decdaf8b06ba677450a9395d63da43c4a5341fe3. 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/NLFF90800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f17ea8560036260856d4c05adf38944c50b965ab159a07ef21c55ebf9eae61. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/NLFF90800046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12506dce254f08d2e3b069f665647f81b6fd25eb2683774e300591c70128cdd7. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/NLFF90800048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4972fed100db6fbae187880334fd340fd4e497806db8e3e2945f0db69f4dcbef. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/NLFF90800049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0043fec23c6543090f56464937cf1ed1da01d8168d8086ddd5da20de502e0518. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/NLFF90800051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1594395f02e8e6fd8a80ba48b7f95d939d78acbb3b93c4ddbbcf342d27dba12b. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLB151000873.