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 0x48bd0f263ba5f50ab64de79ed71368f267714fe787add8f19775448d041dd78e. 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/10b54947-5bd6-49f6-bd2c-2103d23a1bf6.json and https://artists.proofprofile.net/proofs/artist/10b54947-5bd6-49f6-bd2c-2103d23a1bf6.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 0xce195bccce364aab9b04f5bf8594c8424e06e43f88b0f08047de05b2f4661182. 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/QM4TX2212793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5f226f525d13364eb9865d5abbf9b27d2627b00d3210c841befc7cb7e2b5f7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QM4TX2212796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bc6baf3bbef95e67c601bd8a1168884855cbd7a7c44ee8958297a2d924e18f. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM4TX2212797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb2a7195053dc3e73c1084a7cbc25fc4455b41a892f97967ed57e0e413f8df3. 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/QMFMF2201101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40716a232cf3faaf7737c382a1cb976be8019280190c9b3f4e7b05502e1228ea. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMFMF2201102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7128a6464e7472fbc0ba098e35448e84a0b2d524cbebdd7fb32cc49912f49e45. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QMFMF2201104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80a31579afdc696c97da9cff5e09e697493c18012c3266a1ff67b39ee910a5b. 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/QMFMF2201105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5da5d2e960a92b0e43eebf3070fb7b6e69485e61174c001ece5e1699bbb265. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QMFMF2201108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdc25312e875d6bc13e165fa76827dc42198b94a63ba6b6db21721995fdbc01. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QMFMF2201109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0c5d5b92a6a7fa51d83a3656d49ae85229562dbc615c218633c3b2bffdda60. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QMFMF2201110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe716ad3863c696b65b6e26b96a22dcce6add2d19d9259984fabd4889f45b1f88. 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/QMFMF2201111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570ad693901822ca518abf6ae7c6ddb761605b96991b6a6228032c76984667a5. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QM4TW2439790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77598e51fac25ad3365024be80786f63f0b9fb816395953ccbe30fa3be50f278. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM4TW2439791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070418a8780fac7e748851d222b1dac758326efc837c87e5851cbd8ed5f1af94. 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/QM4TW2439792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb2cb4232d192abe4269a25d0cbc81197ffb4d1646024b76dcc77d3c7b4a2db. 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/QM4TW2439793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb56cc5667edd5351ce566ae4f9949603a11a56618d9f7600ace26854314904. 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/QM4TW2439794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510977898a3673067fefc7fa8a471ab11f84b6478da20f10d32bd40a21241dc9. 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/QM4TW2439795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c420a5f0e8674212bc762e8645b7f1e1425974cf8e17983f4edbea313f45944. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QMFMF2522820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5baccc09c0091298296b7bdc15ea91c76b5b3b95e15830499842dfa6bee0d8. 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/ES5151900402.