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 0x624f6c51780b53c39a86e2dff7f951c4a293bd8c7d0b85fb197b5a9776a7b561. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38495916-7e10-4e08-83ef-40bcd3b5a630.json and https://artists.proofprofile.net/proofs/artist/38495916-7e10-4e08-83ef-40bcd3b5a630.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 0xa7493219d9a5dca30f3cf5177f63c75cbe11d0b6c053d8502bcdc3893c8ec203. 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/QM7282035660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58759184ca1734c504860aca7e4ff5375c7bf12bd2f7732e005ee30e304833fc. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QMBZ92063196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4783bc4f79691006e041b1701f441c0978f706ce0eff624d57d0175b0fce42. 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/QMBZ92063199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc86aaba83d759681bef3e274c52225cfacbc8e8877b100e7c90f1e516ae497b. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QMBZ92063200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8caa2b62b63a3329315e516c1e0b949efdc0604f84f5467dcdd31c3522de2f05. 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/QMBZ92063191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123cd2ef209985c4d729314d0b97453b93e6ef0945decc0d636da8be750fb63b. 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/QMBZ92063194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510e4062943e06b9a404da4159d0890cb5305462c44bf2f88826f77fa67be5e8. 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/QMBZ92063202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939609eb2aa49cfd0e6c0bc97df20d86fd441c38910bf82d9ca1aa609cf7d2d7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMBZ92063210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45edb2d9615492f201db359c74b8942ae161a9ecaa7b77b1b4add74276ea961. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QMBZ92090828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7f8a2c88c7e11c529faeb292b6f537e1b768cb21c34b940bd117952c2e2b91. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QMBZ92090829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c17034eed5a46dae3daaa337abaa5778605866c18d287a2c94d15835eadbd01. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QMBZ92090832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7bf56a3aa24e5ad51049d5e829b5d58416e1651c918ee293feb536779cfb8e. 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/QMBZ92090835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa345de2ec9605514a7ec42b31bd7112a94e3ac95db7f68e7cebec542e31f59. 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/QMBZ92090836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587e40eb2857ec98991819faf5226d685c28116cede04a32043cce644a5ca143. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QMBZ92090837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea03f21f3db9d1334d09a29f95061feec2bbbf30f07c129945ce79261b0c95fe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMBZ92090838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff779142f6f2b51a9596e9376cf1bb76461da84735c2ef1038f638288d6822e2. 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/QM6P42218454.