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 0x8ef65811d8df15b647bfd0325469f4fc7a868b4f001f2db15fd6c635461ebd3e. 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/38e54992-c410-413a-9616-c1054e0983b4.json and https://artists.proofprofile.net/proofs/artist/38e54992-c410-413a-9616-c1054e0983b4.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 0xe3bc12db4f31ce6690324e39f091ab5d694ab30afa50b9d3894acb830054a4e3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR26V2066633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6af8f61fff14f663503f92196ca97ec2e4574609b48f767760be7c21b6d907. 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/PLF242107606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ace1de921ac7116d36be2e23cbd503efd3910c2b999e0c190c8befa3288198b. 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/PLF242107607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516eadb0edbcebe68a6f95e87d70e2b01ff7d7708597a12fe4799e2bc5f18180. 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/PLF242006919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea7860f31569a9fb7dffa731df3b8511e1f3081c66ade7bd5ad06cb2765d0d4. 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/PLF242107608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dea0572334b48477f74e9a9bc31ee8873b18b88737c277c670026db3598247. 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/PLF242107609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6ccc09f8c79aa060679b14fa40f5b0b3801ff18d58a272417d55f647f3841c. 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/PLF242107610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27abda2d50b5c772a9e96e42768eea26f7eba537b86ced76144fa3b2efab65b3. 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/PLF242107611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf334f88c58ec24c7ab29fd687785ecead5d6ddd9a0b9341302db1a975a3d24a5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLF242007391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5c30e7ce58fe109168690d7f4e5fdea464da7fcbea14a67951d9a0e80ba7ba. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/PLF242107612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4628e23b8eae1789440ff1114d65e30d228cac90f8e1fbb98ffc1f81ff7686f. 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/PLF242107531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849b721765a3db53acf7177b94d2d3a613168b4cfd64a1e6a58755d2cdaf18ff. 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/PLF242107562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907ffba1cd0a1218970a807d76d96dbc5fc1552ca17a1046efb09efce7c51241. 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/PLF242107613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b75e894506ba01a42d3a4d25905db33634f1a2f1697826bbd353773661385d5. 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/PL38R2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd703973b3c26f5e102c2629cf519c7b975b204edee9f7bff8d2bbc0e14bdba9e. 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/PLUM72200680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4628e23b8eae1789440ff1114d65e30d228cac90f8e1fbb98ffc1f81ff7686f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLF242107531.