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 0x4077b506addde3522f898dc135ed00428875bf86172642248004d68f83721d41. 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/d0d56644-97e1-47d0-8edd-0057a466019c.json and https://artists.proofprofile.net/proofs/artist/d0d56644-97e1-47d0-8edd-0057a466019c.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 0x039c52e62f76a9178c0fe3e0e103660777f92f4394cee9c1f7707e51ac4787d7. 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/QZNJW2466250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcba2e800b384a7f978a9f4c5557e0c5929531f5d11724eb7675a80049e12b74. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/ESA011843816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270a41872050bea64c14bb396ab85af96a52c25a46881e68230f448dae224e15. 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/QZKDT2400207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f922eaa29db6360e099089d4d84d40235c25e29eff5deef1cf89dc6121f4626. 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/QZKDT2400203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057a960d9fec6c2a6e62893237644c1b5eb2149170805dd6129ecc0207e48c62. 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/QZKDT2300428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe537626e5082fa6ba59f17ea026aa910aedf7926b7e1e57e1ef6091506fc0b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZGLM2396288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fbc647d030323f2dd7b031353be6193128df826d6704165aa232275ef232a2. 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/QMBZ92284654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde55e525b23642b97615027afb7fd3c6306ccbf11aab428aaf6c38df362be2f. 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/GBLFP2233299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a75f12156e37c420484865b5d733c8142802ec2d2a95a858078d86f502afa5. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QZQAY2243675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f90c4d31949a4047f4aedc1ad38c04fcbaa9df96965ad78caafc9cf78a629e. 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/QZKDT2100919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4059661dc45b6b1b29d89f368bc3839daed670843e51d91716271efc2ace57. 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/GBRKQ2144026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f7beccef255320291ceac350b957bf0ecfec734460f31b4e6e6e4fdbd64583. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHZ52173924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8fed2a06e2d78db1f4df18fbfec9e99f19e8d9fae419debe0ed1bfd42df791. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QMFME2013541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb7894ca795b216ca87b3906b0030b22aeddac5301303ba704b68efa1dc0c38. 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/QMGR32049169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621bb81ebefe2b4322b9ee1ea89da34130eb13f9f4beba1773009b365383dcb6. 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/ESA011978387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58504b3aa3c30db516e2f72a53a182992ce9379e012d7ccb9e37c29986518917. 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/QMBZ91929750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a697923976284fa530c769d487cf430f6d67aac58bcddc2aa1e8eb86876723. 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/ESA011953615.