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 0x5332003b6093af3447fc5494a8fbbec7a163a780e0c7808388b7cf96b8a56550. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1054ddcd-e889-4e04-8390-ec8bee34a03c.json and https://artists.proofprofile.net/proofs/artist/1054ddcd-e889-4e04-8390-ec8bee34a03c.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 0x10ffe2fe93b950dcbd622b38bad2b906cf4efd2f14ce8d1b7278541a823b00ef. 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/UKZGC2404554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ffe2fe93b950dcbd622b38bad2b906cf4efd2f14ce8d1b7278541a823b00ef. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/UKZGC2404554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199d4fe8f87c5897a6ed80feea77d7fc45d61eb1dfcfc70d3ffd2a1269b01d58. 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/UKZGC2404445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72d682a7a64c1911437954566f4b7c7bea6b010e23fafe4e0e1901bc8f8d1d1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/UKZGC2404444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659e1035d596a7f9e4e6ecfd43d5cc0294f928daf698ca84c7da84f800d1c6ab. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/UKZGC2404443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bc8d2a3f80d4b298e82981c0192535ba924378a37fc3831329fdabb40fabc0. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/UKZGC2404442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70eb1d43e3a02642ca1fb3d495c15410e6421cf0ecdb7b108369e34bc0ad8f75. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/UKZGC2404441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e44dbcc9050c10dc08db4f1b0b492fdd29e3b0da622683309053ac1ae739010. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/UKZGC2404440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1af4cd63281b2dfc62729a0201f0eb037a5942eb29464b3ee9d86c072ccf0fa. 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/UKZGC2404439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x014142efbd97e0797b8ba2b928eec410af3cb5d678ba41132ee31f7eff1d101d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKZGC2404437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9c755b1a5002ffba0047e6bc98b70f454a6ca6223319989fde882294dae188. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/UKZGC2404438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e96963499b0fef3de4261ef61b3545d4e798084fc7d2c147e8518c1945d61a6. 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/UKZGC2404433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0063fc7033774920ed14741aa1eaa4213c86a710ae146f023ea5b849cbde53ae. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/UKZGC2404436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f72f94da17462ac27296c7b8e4092c6464dd6dd09d00cf22398f52624e9662. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/UKZGC2404435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47a2e71d52a5bb4e534ff9d038dd6df391d2dc0d02ffad50e640d1c8f1cf6c4. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/UKZGC2404434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d64d1056788f3df1efaa8ade9ea449654a8dbcd022258cfbe7c8422239a475. 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/UKZGC2404432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12127fcd13777f685a77ddff2be2f45aa6cc1b0230418be41dbcccef1bb97d5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/UKZGC2404431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f11af42cb8fbd187e4720ec8e571e20480792c6be3f10c21eeab4b985856ec. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZNJV2033597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc205e8f8ee5f504f449d47b6d1e3cd74ee7b65d8c8c9a73d069b389b255de652. 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/QZNJV2005974.