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 0xef14c1bdb30f18fcd06459205b0607c050d226066fd6b4d21fd754a473520220. 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/66f4332e-b6d9-4e8e-847f-ac6548ed2d23.json and https://artists.proofprofile.net/proofs/artist/66f4332e-b6d9-4e8e-847f-ac6548ed2d23.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 0xdcc8386216996b4f288d7d64b4bd1e0005105bf34ef602bbc76dacb423d87e09. 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/UKU932300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa393f1db22b664af82aaca83562e288f2f58a9a8a4e68a3cd5f65991d4921d9c. 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/BK4DA2310193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00011c34e38e09e5ad08ed5606a6c69ef5ad54f18fc26dae0bc8ab0fe577b52. 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/US3DF2259815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d344c8824841615612f4973e0c59a95ce78ee0f2c9a4d5e187f4e3d9b95ba5d. 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/US3DF2299433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce750261cc77d6c6484aa2676777e2d59d9e471eba140926f789f11ba5f0b2e. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/US3DF2167866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8724b6285d2233b5114ed4891d137f1de26b7b492bfc75dfafd4f2b56074a578. 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/US3DF2240045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a81282f9527105854389289a2ac73bb025dc7b845b8498aff083b3d39773014. 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/USANG2103707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaace5f9c780985f595f0c2b7db921a4889963f1ca1f51aff9c23b6ed3cd4be4a. 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/US3DF2444783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cde9e25617a4e6c6ff53b9755b1202316857e041ef68334778fbe0cec90533. 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/USANG2233447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa4c459763da454d5f85f21a96dc35ce07a5ecc942b0380b8e6a2a08a732ac5. 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/USANG2277189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520a7b63cfe8be5facb66883931ca361aaa927e68743615ea3d8e863305d8bdf. 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/QZ5AB2364706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc91eb3e643da8f853c89d875811610b86d38b9d606b688d397f2f2f602ce4f6. 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/US3DF2421090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a0b776cc360b1cbd6ebc3ab5063c777cda95d2342c6c05ff2a9ed27e4f84d2. 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/USA2P2404188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4118189eae8b9c2be22d0c3088b7df689b9e86593a67c28368c7afddc9776f5f. 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/USANG2229562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da7631230640ad279c249c72f983e46ce2f9259ff1960029b6d4e88997a8c45. 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/ES71G2216287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b441946739ce013b53d377ccaf85de4e4984732c6d8b5dbd909e40991b5b7d. 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/QMANG2430302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae9af4de3520ff1c342ffe5073f7c1502c890f5af02b7dfe765abdda0665f74. 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/QM3DF2161391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5e0783e0e76186b035c408e18deacb05a84721a61fbff1cc7b6edfe3824e3a. 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/US3DF2065666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd6d29b33efca8c5d76de7c1b45900e9bf608ec41c3db06f6041165788fcff6. 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/US3DF2426754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b5c3e3b07e13932a47d4d96cf6637799392568241b6f245066fb17b0552d5c. 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/QZW9K2466686.