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 0x65b304d8dddcc5608a77c24a8a209bbb5b47fe47ce2516fafeb52fa67b96c440. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5470e76f-8981-4d4d-82df-b04a1eb70dce.json and https://artists.proofprofile.net/proofs/artist/5470e76f-8981-4d4d-82df-b04a1eb70dce.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 0x13cc86a5c1a3a80610031a6a3669e596fb176970613f4385e44548032e1f300a. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZDA71810319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4be9b4aa2bcb57cada908e98e462c3c9dbad19fc1d54f16ff216b45a8e0d24c. 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/QZDA71810320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fe17d5724badaf2b7ba1ba1f812706cb615f564d9deba088ea0155e0bf4e62. 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/QZDA71810321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9ab7ed409edf4365ce32ec2efb8d62fe446b2c7efafe96ae3be74e2e2beb01. 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/QZDA71810322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75dd1f52fb082e53bcb99664504d3bf4db31e271c0a6a6afd2bce5a134a3790. 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/QZDA71810323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f336b303ad1d6f72b641e971ef33a04bc6c0fdbaa1db6113163bd2d23eda55. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZDA71810324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1083f808ec60769e5f60776cd392d0a7acb4578c42165a31ebcefe601a8510cf. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZDA71810325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea20e5110a7c90612799212215f075fd57a0803dc053937795ceb46f695f78e5. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZDA71810326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3477a998ffb22f11febaa742ef8765c171b52dd8ce4cfe30eb4abb401a8486ce. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZDA71810327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7224d7cdf7be20ac59dcd93a5fb2f290ae4b1cf8884c6b7e2a021c7b7b306f04. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZDA71810328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661d4ed4f77c97fa0ef8fca16a0c0e5286973142671be93205b97fb90981b00b. 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/QZDA71810329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4732090e9f233a309a120f65aa292547e1ed24f6a0ee92ae1696e1ca86f2398. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QZTBC2377666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988c9087826a1a6be5efc4d1e19f1f8ea7bba66fac97fac0bfb3aac1c0273a01. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZWFP2317713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ba9e6e8da416b9d5111b3f02eb01ae66b56cab28ee46393986a95b2cc9fb16. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZES62420141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb604cb79bed0636f1b0c50e50437e0663e971e70f8abb7253dc812f5bc80a355. 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/QZES62420142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42be3be54388f8d44ce75de6a245cebf4dd71ecd703fd4712421daa445a3dc01. 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/QZES62420143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87a6acaf8da4627d333f0702f3ed59f50aca320687ff1d42c36f8295e89c92b. 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/QZES62420144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988c9087826a1a6be5efc4d1e19f1f8ea7bba66fac97fac0bfb3aac1c0273a01. 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/QZWFP2317713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4732090e9f233a309a120f65aa292547e1ed24f6a0ee92ae1696e1ca86f2398. 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/QZTBC2377666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33faec8fe55b76beab57e463dabbe5624ba17b1729688d9f484c21b4e3aa5b2b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHN62154413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a4ce1e723d787d395dfe4a2a61e9d2267962c12896da66a34a0ff7d209237b. 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/QZHN62154414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8a416edca7eb4bfecdbd40e040c3b04563e30477589dd9a8df21cf126a83a1. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QZHN62154415.