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 0x133c9a6e075a8f15a16a9f894de793eed9fca7bff5ca956a1c0fe247c7d8b4e3. 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/a1936d2c-1cf0-420f-8f83-6b8ba740f566.json and https://artists.proofprofile.net/proofs/artist/a1936d2c-1cf0-420f-8f83-6b8ba740f566.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 0x0e4e43f7e1ce884e2dd5fb31dc06fecfb8ec8a53bd7aa9265a5e2e740827ea7e. 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/FXQ892400280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff1bcc2fbced9655119c5e63e479e5e4c469e5c32e1ef6fe2f578e25b36ec78. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAQOI2408053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c0d4b687b6231facf99d0f548dc40fd3fb6d27f2ce3f7ebdcb09f39fcfd403. 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/FXQ892300200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72789dbcea14a2e86af0fff469d5a3f7ccf3d3e1898624076a6bef964cabadcc. 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/FXQ892300099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11622f65ee11448517d2718e5d42ccb929400524e928717fd0e6feb94d99a0b. 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/FXQ892300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28fdeaa9275b3ce48b2dbcf10e907e1b96ad3449f64ef2e09dde8f70567bb5d7. 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/FXQ892200554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d5e9eead1e0a89c32082fa817b0a284037f7b494670c29d8f138504c82be5b. 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/FXQ892200550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacee4a42f98930e20ee7183e20be840d6bfcaf3a99b772ccd2578efeeee8f168. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FXQ892200523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4d1b3584cf47cca0b70c2c1394783ec5ffcba39d2cdb509f82ef5915ea08e7. 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/FXQ892200459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf518022d3e8bf2358182789a3cc7df5cfebba0160e4f4aa74884fcdbfc1f71a5. 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/FXQ892200433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477ed1f40616315cfafc4e6e4c4704222517991b7dedc666c422972e95d1cf39. 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/FXQ892200394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e8baa044917eb8b0eb7b504dab24733dcbdb4330091c8e0029aec4e961c20d. 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/FXQ892200334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f99c035da6eca053e5f3d7ae4d5917549ab6a4f4f406ec0a0bd22dcf0d6efd. 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/FXQ892200235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dab813d7d7c3a693bbe522347ef1608a64dc2dc58df3f77fcd9325e1b395241. 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/FXQ892200111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a103ff4971c506ecb66aebae46d4b8b5f7057946bd0e4dacb37b12ba8b9957d. 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/QZFZ32228579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc98d0d0004d170d9aea0d2a6c330ed980b2f1ccd816ff5beabf12e2cf9637d. 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/FXQ892100100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedaa2ea88656b371aee1d3cb603437ef0f54b19034c286658f76fb3e3045f7d3. 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/FXQ892100062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5a9616abce35eaff1bd9f8543dc199e81c6ee2be0c54ecdc90bff256e9dd6f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FXQ892100042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f81b3bde63cfce6ac4a086a703ddf820dde4784e0a0035f42988748b6973b4. 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/FXQ892100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a593a08f60ad06d0767d44f016b31ef607881d566699f677bd96961591e21a. 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/FXQ892100030.