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 0x1ca1ca8a5599f791581ad596825eba8fd5088678a249af78985aa957eb4f7f00. 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/f86f0757-4c0e-4c1b-b97b-8f945068e676.json and https://artists.proofprofile.net/proofs/artist/f86f0757-4c0e-4c1b-b97b-8f945068e676.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 0xd8bf0c8bab4500d9cc5034e48b406838740f9c843f8ad36a27ebb30ee2a482e0. 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/QMBZ92561023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc210897e5daaef980a05731d5f9282e261123fce5d7c8a2a1b535b59bd2d9fda. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/NLS241600858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6bb63f8d5eebea88e2c9cc49da653cb506df3f926e34d03fa0164180359be6. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/NLS241600860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6893e970230263783b51e7398df6f1d4cde9b58f3d10a71f8e2f6b2b8048dca. 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/NLS241600861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f3bf8c821ccc51735d33fe485861664ec404834e5a7b0a2e4e1e50e2c1d93f. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/NLS241600862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0476db1fae971423ee95b2665416c7a0d0d0f6dfabd386d1d9d3eec88325be22. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/NLS241600864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d008e634d3b59d7c568d700bb8e535a2917865ba391451755a087d86923e800. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/NLS241600867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52b44f0a19b0753d08be0c9c00af0d5e7a899d06dd3276d9a33a4ef553446a4. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NLS241700147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8b68675f8806410733b08f73d9f36b7cf20bdf2addc4aa8cde5f02777bbe9e. 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/NLS241700151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b7d5ffbd6380c585e0213b3a572105a9fb3cb1108e617aa8c7ab70f495e7d7. 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/NLS241700153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e0d175c311e96fb246151312a4fe1e83f3142ae9e1464f7ec409d4e8acbbfc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NLS241700154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748300116e53d49314ad8c1ce19eee2573cd919c72dae5acb7b8e659fea077b7. 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/NLS241700157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127a162f690ab8bc705bb49b58e8058cd4cb004ba9edca5778d99b9e99f2bb2d. 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/NLS241700158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2836082d4133b93fd63a30a96075a600722004857dad3f7141f689eb709652ec. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/NLS241700161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab69aae18c1e2eedc6109c6fb60e3f1cb06757256cfe6ff423148e8fefb8974. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/NLS241700149.
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