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 0xe688fd32a38861b98da60f99fc0b5d52ecf3b5c697b9f57d06bbea7052e5d80b. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4fd65e96-f7ac-43ef-9eef-6044a66d9c79.json and https://artists.proofprofile.net/proofs/artist/4fd65e96-f7ac-43ef-9eef-6044a66d9c79.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 0xca1f233402466225f2631066e810da6c168864a62e875a4f6f94147e2f86c695. 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/ES64E2203238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5043c66b3051ee929a788b88653a7905444f879aa79b5f003e48e6db4dfe1e. 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/QZXLZ2401738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2411f43e38c5bfa1e863322503a97e5cc3cbd8f136c628c90ec1d490d68e29. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:25:51Z), 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/QZZ972462709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda09470bf5dad00b2c8610af5d68eff2281f4c08f6736a17679bd39eca3a353. 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/ESUM72302388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f4681d0dd77fba25ccf4169e1b4dfd97d4234991955af44e83bdc1524a3a11. 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/ES5702201775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f51f4d740ad2bc7b9390b0d0ee268f465ce435becaa54966ca0b8899c6bf936. 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/ES5702201548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578f6adeb737c826447987a86067feaa37e9d0ba4b7c7b60468ddbd079f981ad. 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/ES5702201547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a277c55f5e4bcabbe223725cea66fe66acb5be4c41a4f8fed9fd90c38a10c1. 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/ES5702201132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc814cae2e63e20b8c6de9da025c420559646c07be87155795a90df553906fe53. 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/ES5702200631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01be05df00a5430d348fef93129a1646f6001a62d8aa75964eab49e8eac537f. 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/QZNWU2196283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae947c1e011a7db32039d848c2fc3cbd894ade17a94aac0dfa3b95e26cce592. 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/QZHNA2139684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eff5930ece6c3f1ab1229976c031adaddb222eb4ce9cb96532652b9bfd4ac11. 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/QZHN42159230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7663ed25d8c91f8a2c23466e08d31eb1b0eb168aaa5c985dc02976dd5d53c91. 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/ESA011638992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5f511addb0c737d5fe2ae05a6d356bbc671f9eaf666a65aa3718aa1fc4d1a7. 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/ESA012074520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b9a24ad3892afe9cfed05cb12be47436a7cc4dd205b58d098b492f01245836. 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/ESA012028439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19ab7a8819329d3b4c75494ee593e79e91b5f9beba29d063b9295963fc94f79. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USUM72305095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db65e4370f44e2190569151cde5772bfd867d2bcf88d1f73a53083a98eb9f0c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UYB282266000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40fea2bb477e1ee98d8671a85358935ddd6733076e261538385198094c218d4. 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/QZNW72410742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98f601c17cea9410063eaa3bbaf5be3b03800c95f2245ba5656a6b8133d8cb2. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:59:00Z), 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/QZXLZ2507555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51038d64de30c9ef16c4a5d4806e9fbc51ae7f1c8bc1c5f986f429abb3b4f679. 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/QZXLZ2507556.