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 0x68812953804c125e9623125349db8061a241b318f303406285f46965cb861275. 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/f4f64d9d-260c-4996-ade6-e4ce4e7f202c.json and https://artists.proofprofile.net/proofs/artist/f4f64d9d-260c-4996-ade6-e4ce4e7f202c.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 0xa9ad02bb612b461b368cd2b2d1b49354f5f71a134ded4bea25f6e6631c98db44. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZES51973968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73254698369f95b06fdf6d23257bf57d1f88d4259c9681f5c62b0e5e687ba881. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ52077765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6ea95edc0f0bdb33f498c2d4282b1193c47e4d433ecb07e0966e6e5f651b43. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZDA62071824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fe3ad6462b68bd98ebb87fbca600f8be2fc607696885965c773a643a8fab82. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZDA62093201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ffffcf970dbb7fd7e465aed026a2eaa787ca9aec84fa90ad1096cc4fbc0361. 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/QZK6L2025604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae1cdd7e17eb1fd701854b190132cc01c557feae1784e598b52bc4b1dc0781d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFYW2143570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe230ba3b084fd2e2fb32c6637e7bc3f9f4b7d74f6249296918257ef9ea106bae. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFYW2150954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d1d5a82d9fd97005b0df7c121051079ec0f81ac336e54de70f8652073a3cad. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/AUMEV2133998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5283072811746c4d082e21421fa25c36bd2feaacac88ada7a5d9bd4fd35f2266. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/AUMEV2143788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa74f3097f560b00ef3234772f716f96ae5813b3c562c66b76d4970573d97bc. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/AUMEV2143857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa913258e5eb62dbce3de1cf5a041c24ff70e5e7fa6433d32239adc4ccf9a0145. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/AUMEV2143865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ad4ae97057e00bc009fdc3c1484b2ccea8f5566ce665f1b2a3a15f36f60ff4. 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/AUMEV2143886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba1c751e0d6ad008db8a2bff605c4a517f1883260e618be1d0f1dda5731a536. 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/AUMEV2143895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95f2fee706260bff67f1eaf5b56efe1b8e811d63a33fbf9fe2027bcba8fa7ef. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/AUMEV2143897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc4d2166affa5ef5411ec043fc69a448719db65dbc028961bcdf920064d446c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/AUMEV2143898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadca5fd0fa2b3f5322a83933ae9dc8c905ac1423d61f4c3251a020cd0cb09477. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AUMEV2283923.