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 0xede7b096557eebcd8df8817848d52c2c087793ee2994337a6bedb4d213978b8e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cb1b21b-896a-449c-93e6-bbc9b3dc4742.json and https://artists.proofprofile.net/proofs/artist/7cb1b21b-896a-449c-93e6-bbc9b3dc4742.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 0x7ad62e64cde2e5e39b0ab5ef79ecd9f464418ef3d0ecba6d743e47bc8f667c4e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZH5E1958276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7709497e860e1112274a3dda64db23aec79af1e24f0ca0a2373782cc5d2e9e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USA2P2342160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc790bf9eb33b5bcaa19f5a8b412d7b00633f7f961a23c7398c13c6a16701d209. 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/USA2P2361151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a2f35cd7be7be42d7c51646b59d68119a935f579f31aaa69cffaee53c4c353. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA2P2336257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9038e72bdd6a3762e40a368354a9e9b797a47fefd8ebae3bf6eaba0066b844a. 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/USA2P2352859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa872fdceabdaaf70edc37f6e626b55b8ae3335bd567597c3be02fc9060c2b0c9. 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/USA2P2361153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a237d8a88cc98c80f37355ae2ee73b1ee86f403d5fda80eade7c30925d0a70. 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/USA2P2361150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73028179ac1de6d5121726e818e3455801737961bbfa5486ca5cf446435bdd3f. 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/USA2P2361152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd243e34e172e8dd511f4121b9d54b822020dbe5d86cf39f431c09c0eda7887ea. 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/USA2P2333366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea30676b824d2db8099ef82dc05b6ddbcfa273c482584610a74f72190eee314. 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/USA2P2361149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf3d3f3e8239d0bf49edd99ad78b6107bd8708dac3870c57f0406277c5ddbc3. 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/USA2P2150241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb6be36c02c570b5918f0d13465940933c9250502665630e45590334365ac2b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTV32469423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe601ed3c8c7f5bcc9501b3fd986ee26d4ee9dc8bb4fb4a8f41d7dacb61a4700c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBRKQ2426942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c34bd1066d3ca655658a9e0e3a329359be975706164a2fae3dd0fd56c87020. 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/QZTBA2362785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ac2daef6f25f36eb2cc29469a406824ce26c63eea28777fd727d853d109fc3. 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/USA2P2313497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667b6564d25505988e8d7c2bec1b787975305d782820aaa727dc296a4cb9cc0f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZ5FN2257051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101c4f322ef6648f0a5aa2b2b75fb4880fac1ffb26291b0e01bd0d29b07ab208. 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/QZK6Q2196495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68949ed35fd4505ed7016804faa32731061e93ae7b2fca85dcaf59abaa7202d5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2P2262596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a53fcc30d57feef83c9eb13cc352ad741627b67274ccd913ffe451b75dcceb. 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/USA2P2303644.