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 0xb9e6759543375787807c1869b6234d11f52ba0ea9157194228aa6bb6a0c1e5a3. 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/a746b6c5-8d77-4675-a10c-d62dfca8dcbb.json and https://artists.proofprofile.net/proofs/artist/a746b6c5-8d77-4675-a10c-d62dfca8dcbb.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 0x490592e4d10ca8872e0350e02ec530c454daae988b439108e0515cafd0e22ca6. 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/HUA251775301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d54baf81a72c2c8da7bb9ae140c81305aedaa2f08e5e56a86e99df726fee6f3. 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/HUA251775302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d833e9d54aa69971d77aa798152b8f706e645cefb57aba52f8c76212263a0d5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HUA251775303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664e2cc77b79536906b7920d6079604c30f54efd959a44fa09d334339f6c0c49. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/HUA251775304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bef1859150f3487528b1255f1b7f0a75848bf4ca22147eaf2b46557a3e79d3. 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/HUA251775305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f38fc0e3ad340c7d304809954ae2e5e8b074d2e82abf072831d21e7aed355b6. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/HUA251775306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2284c53c27defa145d5d01768ab5b6427a58558d0e501b6f266e2665949f027c. 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/HUA251775307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc988e8d6af4600abc591b3b54d4a9e0ae11259ecd5c210c93215c4f8d2be3d20. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HUA251775308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8e9327b33fa3e35b6349bf47248dfde5adcb06ca3ef816b7f0142a7913757e. 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/HUA251775309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bffffc8e48d0864ce11839a6dc0196f15d13393b144e2cd8447a0b3ebd8dac. 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/HUA251775310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b57a506ec81a2a69789245dac7605d492bdb2e096ec0521380d06d49979251. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HUA251775311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40b712423ddbf253e4bb54e99b631c7b8e8b8992f545b4533900fe4d2d038f9. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HUA251775312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02531cf5968d7905a6db35aee622d7fae0cd5f0866415f4a7e6245cc03d2044d. 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/HUA251775313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e38f86ed763d088ec0d8ceb89daa19fd2b643b765723e766780c66894cf228f. 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/HUA251775314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1f769e5c9f47da12609d70b9bb3cb2ccf0d14da21d603051ac97759b2b271d. 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/HUA251775315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2ba38f3f6b76aafa54cc017f23f5af9d4f585b08c18678e675bc864028c4e9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HUA251775316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd95a655f416bf94499e42d7140d8f0d6d1d09c2711676c34d0cd6cf4ea7d3e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/HUA251775317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e60184792ecca30e9ab3400d625c815e4ef26790306b598ffc94e6d1512e12. 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/HUA251775318.