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 0x707c6f2dcbdaf0c35c58faf6e90b48fee6ba449342db27a8e34ca2f5ef25d714. 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/0b3f3468-5fc6-442f-bca6-3119ddc7e11b.json and https://artists.proofprofile.net/proofs/artist/0b3f3468-5fc6-442f-bca6-3119ddc7e11b.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 0x1e74d452e2a9bb16a13cb9cf2645f2063e0762166e7ca0e183d51563e9d9fad6. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/DEGC61501451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b3e1f385b8729af1f1ee6057f142ef94a883c12d6ca9a97eb03a7e51bf33ea. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEGC61501452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc609c21ac6c3760e892e7ac62021736f498d41b36bd39e78962e8af6694ef222. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/DEGC61501488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c21d527bc4e3de42726eabbddcd3444a33cf63a12388b228f9ee164a6e08223. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/FR96X1692508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227867cf0506d46c6f300b9c36e2bb37c23386893601d17561f914dff6dd06cc. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QMFME2019982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba7e950d7bacd8f184376b399716ff0f0d4c9b38292e23790300e80b058bf59. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/DEZC62595514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348ea4e7f82a441aebc3f55821c89bb7214ff9cb6767724adc10792d6c7a1754. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DEZC62511422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f033f854809e2fb15246d17cc4e9c9ad4a57f5ac8e7a41fb8f39e6fd2749dd8. 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/FR96X1784582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce86e1687467e4fe49327a253dd8a74419f4c3c2f0c227d35eee3721acbde3e0. 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/FRX201773548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73f08c5fe9cdcf7bf4b921c8dbae7570350cb442e5b8420b06509c7c58a87aa. 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/FRX201773549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8babda7846c36d8b8059a71d7dd18290dc6a42f5223a52a78eeca233f47a35f8. 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/FRX201773550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b57644480db9301e841f7d443dabadeae806db48e38baee718a5f861b054c9. 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/FRX201773551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce86e1687467e4fe49327a253dd8a74419f4c3c2f0c227d35eee3721acbde3e0. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/FRX201773548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0102003556db88c86103c8e8f00b29f66ee684f5f7fd0fd23d18e0734a95c1. 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/NL1AP1921399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d48b8e4100704f08e8608f63711147d19a541a0904a92c174f92c97bad28919. 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/FRX201608901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf431bca33662bb58060a89cc6be164bf8d155543abdd855940269639a18449f6. 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/FRX201608902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5baa6515545654b69fd5d4962b40a32151c9a962a5fbcc83d74638faa4b88e16. 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/FRX201608903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fd06606fa3f7da6829326b93bd7d36b50dfa18fc8a48609d36c95341ba38e4. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/FRX201608904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81892a4f02fea6f21432297b813aba0c90a598635ab084a79850c41e17d0161f. 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/FRX201608905.