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 0x9339acc5680be097f4e8e02f02dd5cb93d62786db3703a0c11766141ed255b33. 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/6c21406a-586c-4897-8a55-13934a681c50.json and https://artists.proofprofile.net/proofs/artist/6c21406a-586c-4897-8a55-13934a681c50.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 0xd035a729118db334ba10489574ce71065b08fe20cdc6f71f085d764f351837f5. 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/QZK6K2491356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09c7989e238b0b26afebea94eadcd461fd7beb5edd22e42b462451ae9fb3e2c. 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/QZPLS2478733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e542e3600deec83cace993b359176f0658d55e2cda075b13cfd933c9da95d6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB52487702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa438e3c7cf684e536b5a47762d319827cb482deb256a6795a9b81ce97a914d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZWFF2485416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d7c2b990963c4c1ba2a86d26fe1ac6e54819f5226342ae0aa1c5d6545a2d1e. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFJ2497963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d7c2b990963c4c1ba2a86d26fe1ac6e54819f5226342ae0aa1c5d6545a2d1e. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZWFJ2497963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846b728705cc283954eed619bd37e857b6fa4d474257dede1121db92b1ec70ec. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:37:48Z), 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/QZZ7N2411437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070803791e977598e8c5405a266b1e56c1da396b7143cc576a6d20136a04228b. 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/QZHN42524153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08eefb2b45778123c22577c2431e10addfa5c977937da34d07e0c3a2b9acf145. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:59:03Z), 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/US3DF2523191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50927584567167301d729b9ed64437b0b6d2e671f41253805a5cb49c3c7254d. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZK6H2575942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eccd543c0c93f8a493610f760dc2d9fc902d8114b1b898d8b3fc59ddf7ce17a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZRP52529224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17e37086adf5b5d38852d9f69038a9639612bed8e19c801c09fc1aba5bafc4c. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZTB32586503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ee0528692712349f725d2a7b79c5264763c8a575d454fa062aa6a8e88ab9f6. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFX2566767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6115246ffb4eeaf6b5c51c8c817bbe73f35416e034b661e6660e5aff72a40b. 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/QZNJY2408803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ea93494b5eb82c8f65a484963c72d266d5ce2af7423310cb3737dbee5cd076. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL8RL2449614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a480ab87c10d2bed45ab7a9c33a27862ce7235c8d48a1bb315fef961c73a1d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMEN2419981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d73436c99621b864f426bdcbf8fe78cb97d2ac8aa773a3fa1ff80c311b497ea. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMEM2420787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f10e5d499aec941f663d2f0b502c7242075dc8ad54ba20321da6d80411521af. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB32495403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd6b708611e0130273c94134d27fe75c0b889ac86d82b4b88a5abbe27a59ea7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWV2463819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34abd61d0cb51c043201cdb5e3ebbeeab611ed68289b36d5e10ba1ee79f31b03. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEPI82402941.