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 0xb3f73869f436bd8e373574fc460f4947f93d048dec3dc09896ecfaeef284c01e. 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/8ad8e42d-c1a2-42ca-8212-661031504f76.json and https://artists.proofprofile.net/proofs/artist/8ad8e42d-c1a2-42ca-8212-661031504f76.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 0x4f5c59c81b49b33b5d63d586c65131d28d88a0886b3fb05ce76612e2f19fbf99. 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/DKAZ72022103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd02d6b59ab98826c47291d28adab3198b399a88e519a10228dfd75933babe41. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/DKAZ72122104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fcfeab558233537c1d3ccefb080bc28f8d4799667807e8b89a884b85729e94. 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/DKAZ72322106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6a58306cc3cf5547936bc0609564f4213febc02e38596f18517cb72961704f. 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/DKAZ72222105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209ddd87c262830822d107a12e5f23833efb0ef21d4788943340bf82d4b94931. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DKAZ72322108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe9258447a82d8e182371a22e17436de8bd12dc0315a520acedb457253cb997. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DKAZ72322107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69bc3ecdcd1b844778166c308b0b1f3ba4c7d036c12ae706de7a7749987db4d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/DKAZ72434101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5751dd8fb425f3217ac90c6fa1695220feaa81c1644c703f50f3e9ccc3e1dc39. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DKAZ72434102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92124a004a6edb3e54d1471613bf99600a39803378c2a1c5976453fb74c3282. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/DKAZ72534104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f850b95ae667e067276c3575323fca0742332609682767fa4f7ea12ffa2aa4e. 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/DKAZ72328701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f850b95ae667e067276c3575323fca0742332609682767fa4f7ea12ffa2aa4e. 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/DKAZ72328701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bca07f15dcbddccd2ac95873b469eb58365dd5e0d7a27d4275fa6c9b9c5123. 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/DKAZ72473001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f850b95ae667e067276c3575323fca0742332609682767fa4f7ea12ffa2aa4e. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/DKAZ72328701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69bc3ecdcd1b844778166c308b0b1f3ba4c7d036c12ae706de7a7749987db4d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DKAZ72434101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed463d4938709247c4f682b7ac68012b975ac08ca8e8ab65c6b2a32ae7e4347b. 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/DKAZ72428009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf496ab509cb675146145a80e91a5897f30f34ed3389f3d4f8d4bf149be8b85. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DKAZ72124704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8611ff4b09c317139fac9194abe8fe7cc0384922118cc76b5fa72d4a211aa2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DKAZ72436507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671791a61733c60a09e0ad2adb0fe289d7d96936db1d0cc967b57763d6b6e417. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/DKAZ72462401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd34b538a5ff2d2022f738a5df445fd9a3fc090d2612125c2e83de07eba46a28. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/DKAZ72462402.