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 0xd58ce086f2386614f83f46fbb4e80196094b769ae94599b77b894cd85e83b836. 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/5e96e9fd-c849-4cd9-b3db-6f1b060343e0.json and https://artists.proofprofile.net/proofs/artist/5e96e9fd-c849-4cd9-b3db-6f1b060343e0.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 0xa9e8828b26a143cc7dddf916f83d0fe80052f794badcb65debb44b6ea7c0c9be. 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/QZHNC2442310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc816d099a7a0873e2a4b1afb916607d85b96a9568152b63ffc7cc14c3531af57. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZMER2474162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417871b2cfc0db1168bf04ec4a4d73e25f40b7b56e3fd291102d1d5840857017. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZMER2474163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9badb489e9534c7d98a2cfee3724eff580b003f7150663bd38075d51ee86f93. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZMER2474164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3c7c76911b5a56b8479740a46476879788de9a92c54293a52468ed158e3054. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZMER2474165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1951a957eec2a123736b7bfa489bef5fcc59a1fc9f7d3cc873cc6347976bda3. 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/QZMER2474166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f37512ea2c672be42b16ed84f2121732318c53c07c22ba2d13cdc69688bc2d. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZMER2474167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a343d7198000e042264f299cec302297f22cad730d6b67b18bda30240887bfd. 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/QZMER2474168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5cd67291f7727023070119596d3d56012b1ff79474fce1ac3f1c286dd5939d. 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/QZMER2474169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd9113bfb8e6ea755bceb070854acbf9e01b14a046be939e2e8aa4b2196b515. 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/QZMER2474170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe76fca7e4970c0fe98ebb189fdaca8a3b43b08ababbfa574fbf5ed5192efc95. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZMER2474171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ca23fd00e50b72da0b5182752dc81a9567fbf3045acd04f4cd93bb2289f90b. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZMER2474172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30cc75beb700a48d5ea73837a2120d266407c01447bef0d5e52a18cd34ea5035. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZMER2474173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe694f3d012fc2d1270147a3874ea7a0d4f76c7a85061a78d0417c3d1173de145. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZMER2474174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4088316c59623c1c83fd1f315f18dd1019683d0b56f53bf280038e132702c01. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZMER2474176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e8510513502071a5b98cd7f0904ac0bb91dd26c05743c6fdf3c986b178fa6a. 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/QZWFK2487619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea69298dadadc80b0ba51c2ab84739944a43dbf1379b8ca0101c9cf84144a0f. 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/QZZ7T2427053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9077a6d0e2c2b7ab3ea9eba5a982a3e51fa5af37a5a3dadaebc92ea37e8d24f2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFYZ2583729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b17c68c7332ab36807ed6f478d71ee1fae29d4d6dbe9fe2dcb42bdcb232ac6d. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), 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/QZDA82593477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0ecfa1b3de326a0f48ec0eaa10099389e5088e411a418a5f116cc9359c88c5. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZDA82593478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e0dcd03c8c70d534325097a991f113fb6e8df65a6a1e04d6b6e089edb45f1e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA82593479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37feccce838c6aeb47e92dd33c4cca92638197cd25de7e52f656be9c3610795d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA82593480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe07b39eb92932d2072883d91c063727ff75bc728f57972386fc4eda3493945. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZDA82593481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5fcf461e382fe20fcf35319a011cfecf6032f81c8a5f4918cf06aa25154841. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ7R2514510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dee249b89067589608c6ab0a5af68cf7a43e51ff931449faac1607223539a85. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT3F22597960.