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 0x2f8748429ba2ae092291196ab88623fc7dad339f2ca1bfa92d6d29dd5eddcd34. 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/147ca405-ae85-4586-90ee-f42aa1f3cadb.json and https://artists.proofprofile.net/proofs/artist/147ca405-ae85-4586-90ee-f42aa1f3cadb.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 0x1763d85ad673957758187073321c881043ee02f84b8b40d72a4394723fca82dc. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QMPKX1613071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d774bdc1fae89d2de3878fcc2bbfa944bff2d34ae5fe7fe0adb770762d5be02. 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/QMEU31801702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cebbd7398340837dfd05110c14022d4279b167636b287d8ec9f05e5352c6e5. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZDA81835382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095a4c4875f28d8f2e11e1d5b3847f174170370ef45a523253a71d5f242c8850. 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/QZ93L2005716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05589bf9eafb7d93db307d3296c29a714f870a0a074000bfbaf0f9532c9b663. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZES72388976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c1c4e523425f100637fe948235c69ee6babfaf400aeefbde4f526a7b7591c0. 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/QZK6P2309591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d74a6a97addda4040beb325a3ff9ba037aed1cd266747984a6ebeda74f3c39. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZMZ92445584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7232c48613a9acf9e8aece345d465ca707a10843a9838df1e2e1df796f9152aa. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZNJX2438953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d35b4dea7b66301cd09751386e35263770a83f5b7a7ac7737f89870a734cdb. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZTPX2420229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2900823c210e5cd6c99abf7b132388981c05db480da0bc63a40a983c1646740. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/QZTVM2455029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d35b4dea7b66301cd09751386e35263770a83f5b7a7ac7737f89870a734cdb. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZTPX2420229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2d597071385f4936c60439aadbcc5042cb86a91c42d1fbdd34de2250a48772. 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/QZTVM2455030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be3c7038900dbacc12e173426a8dbc496a2d00b424dd018fd969ae80e8db677. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTVM2455031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54bab5404ec45a3292ba76351e0f2f07c7437a62bb442683cfc665de429d6ef7. 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/QZNJZ2403847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e95c77b4b9af343c7f5bb80b2b5b92492a69ba5371a65d505312d7896d7275. 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/QZTVM2455032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c83a8e406cfccfe6846650ddc3d816986ac349313a07e57af7ec02ed0dd564. 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/QM2PV1606061.