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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 0xb2d0ddef5e2af3ae3f9ca3e393bb5e9cce67afe533d56fc53a6e60988295d582. 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/178923a8-7b0f-4ac1-a0e3-95a5fd0eabff.json and https://artists.proofprofile.net/proofs/artist/178923a8-7b0f-4ac1-a0e3-95a5fd0eabff.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 0xccf170c3d22037554618af156dd23fccbab6ad0472661f66379dddbc990454a8. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/TCJPJ1902284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7cf06e2708a1fef2a9847d2b7a6bf8f44521fad2c63b3c5fafe70bb312f617. 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/JPS801838704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f7e427014df139f5158df854cf78d27cb1cf78a39122e986ae44d019b8190e. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/JPS801838712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c887c049945a1052c3a0c935c18527bb6ef66439ee542d452f72dfca2b71ccb. 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/JPS801838713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac76a1f6d764929e9de687c6269809d8e6f1d0d1cf16ccdd8ded4ebb9f117feb. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/JPS801838714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ceeb088790c2c01cc8e4c15bd8b5e4019edc8233032d9a1a580bfe5418e328. 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/TCJPM2047609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39db2afc7b7f4c6364895e561b7a32b6647cce6992840a1e8de849ecef40f4a4. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/TCJPN2020662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd1ace24c6bd9d93df93dcd4bfc696259ce6a8a463be1c82c689ff5d73c95f2. 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/TCJPN2020677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31991542c1df857016b939fd679d4a3051ec3176beb0924444afef2df4a29435. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCJPN2020694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81245c7be20f4f229bc6eb089b1ae9cb0e81c5c0842f325b1a5a1aa4e7ef903b. 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/JPG102201336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45ae0b0fec1431fc298d07c47eb9efaf4d3df204573e88331ad2f13600fea56. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/JPG102201337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb777f75030e4fe57b439248a0dfe994be5f756ce85df89ea039b3df511ee437. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/JPG102201338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65dd4f263aba848e3fd7b517a88a72ddda4a638a6d081ef6c7e5c3941677305. 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/JPG102201339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf040b29e13a6770a85f0476f84e56e32b383b8b5bbc6f98b23e7d4131205b0e5. 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/JPG102201340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217fd9fb0920a0d2c910903f4526bfeb520339fe9ac9a611882c717e147e6e7e. 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/JPG102201344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ee629cc0940f883e25f2bf380d561f53f9a770de95783f77a6f82b359fc263. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/JPG102401129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eef7bfaa88973759397b1bb1b837bb94a08ba3835c5eba3a3551bcd7402e389. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/JPG102401281.