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 0xe7a5cf12e15226d5fd7ae6d1e52e406c42e14b74d31543cf26a8298ec95f8736. 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/ac672a51-9d77-454a-b313-2b47326c7a59.json and https://artists.proofprofile.net/proofs/artist/ac672a51-9d77-454a-b313-2b47326c7a59.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 0xe2e25163c68377e6288c1e619c4d8db54f2993e8521b821e903c52a2903b9c7e. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/GB8KE2205955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3ab5a1e4c89148158e4820d994352c1e8ed609e363678e7c39440de66cae66. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/GB8KE2206002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c0688c2bc68bde19788a25387cc8232823603a3e4bf714bdd217b9f8a74c3e. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/GB8KE2314613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb269c959ad493e04d45da322bd943bb0b1205952e002e78937e518111245735c. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/GB8KE2317511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11e279d7c8653c931acc5fa0b2eed864d63ce7d4fbe70e95e1a97bcf82c17e7. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GB8KE2326989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebb5cb3bf8475aebb53fb2a54c60f05b7839be7a435adad06990ea10ec46a1d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GB8KE2328354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb7e6bf7fee01367388fd71f9d8dcc23a2fd15a64787dddad91626c13541caa. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/GB8KE2402799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0929d0031398c59b6be7e733c3962c0b0774f47ace622843abc258e2e08d0a. 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/GB8KE2405393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03147371242ad5742a235ec708bc0771b5ef29bfada15ea9296607379be5d486. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/GB8KE2406811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e14c0a59393c9b68bffea262d3c27b1f50f8f74c8ff351760f153287a0e062. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/GB8KE2407777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb926931c10e52b5ab295006f76f3dfa1fa654eeef68d4215e3e385ac98a9ccea. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GB8KE2412247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0cfc71d8cb7cd9e524d5942c95add54fd2b7ddd66c53337e4dd49229df9f21. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GB8KE2414119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b1165c4b0d94b62175a343305b1b2f8ed0393e273d4b75cfc57a0fa53ac0c7. 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/GB8KE2416014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe062b52f23b9199b555c19106bf2cfdfb48efc6eb9b6b710a2dc1712c192ca33. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/GB8KE2417660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd137e86e5d4813e7253b7b42134142936c5cf41c9e4724093a202426e9a985f8. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/GB8KE2423511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031586705458acd934368d0a260cbec9927b753b0b6061159a2c0f1f01f05b83. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GB8KE2507451.