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 0xabd493bac15fdd70dbe3b9536a4ae9ed16100f02d15fab520328e9e1aa627f7c. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c88300b-bb34-4cdb-9802-b8dc464b0cae.json and https://artists.proofprofile.net/proofs/artist/0c88300b-bb34-4cdb-9802-b8dc464b0cae.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 0x4b81155e8d7530b2db855c32ae0bfe871680ce58a55b7c7d30627d7c038c9f98. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TCABO1356410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863b501e26da52539f35fb14a4cc2ced454fc1b4747189f18ce9cbff49220db6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TCABO1356781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc598d892351db772d9023dbdff356dd5c25c9346f35dd36cc31284575f8c251c. 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/TCABO1356786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129615d255e58d3186493e677279cbe331837b566692de0e2974fe460879e51c. 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/TCABO1356793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5a817d0d7c83c28d73284a44706c7795aa9cc9dedc8d105f4bd20b2955d594. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCABO1356802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476d06275af6f4a9d0e02bb118c9c1f65d28ac98b450618d60992c22e6f236dc. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/TCABO1356828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44be0ab4ee0a3f23c22e45344928584edbbcf62ffe7761c20b9eaf325044f1ea. 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/TCABO1356834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d734add50e36782a90f2748daa19eb4131e6d3b17b8211cb42fa30e6bee48e. 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/TCABO1356848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd5f8fc40bb21aed18875dd4b76ed56d45e164f7a94ef7ab212eacc4cbc5af3. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCABO1356876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee54db54c8f09315816864b4de45abf2076c39ffa7b20e3c7c4afd0e4457de6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCABO1356881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1360905165ce09365470473cc9c2673bd8fa492a998eb565373154f13e30aa3. 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/TCABO1356882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce66266d4fb8e42485f84833286c4f0de50294396f5a20024c38ae895a087a9. 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/TCABO1356895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe494cd7d6dc0f44925a0de4ec74b55d100882143bc33fd4be3ea9db9e0a4a4f3. 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/TCABO1356899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeefbc5d59cf2b61b6a66ffa931e3cbbf6d026e8e2a425cc822c91d9e760ff76e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCABO1356907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21beff2b3b7ee5c1c80c0006852da646b065b7ae8e9345182bfef59b87b375f. 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/TCABO1356909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297293515ef2ffa8749ea8a91a1d23a3371f9ec947aa79d79e37f92d8de148c7. 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/TCABO1356910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad9af7f3ebb0096bc31526116c4cf89e28d0142053e17bb8c65d6f7101eebe6. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCABO1356911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba1fac8704df710168b343fc00b96ec5c0bea8feb487671d093d60e657a6236. 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/TCABO1356914.