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 0xe758ebe120d5fb056688c043dbcbd6254eedc120445988a8cbbf40a0ef572f70. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/621277fd-fc37-4c27-9b1e-4b533d853591.json and https://artists.proofprofile.net/proofs/artist/621277fd-fc37-4c27-9b1e-4b533d853591.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 0x38df56c225824104f1ba0c812d07967a111e55624406ea09b6b02a6c118d3110. 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/BXIV82341109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08883faf1072ef2ff84eed97075b8a99746bac38f67fa8b6380a83b4427d5aec. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/BXIV82342415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c14f0fb3fa97f68749cf383accbb9ce20d3d8a613cd576fc510a349929ca9b. 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/BXIV82494940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca44a9fcf09457e328520e62faeea22badf1d9e276fa3f599fd0da84b219fae6. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/BXIV82454252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db2b4bccf0a7df71fd8b5752ac13f97c2248654d2ff946d4c8900fbaaf7a894. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZ5AB2454467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7dae2bb092c75ddeabedae485d358bee8b70350cecc812a803bdebadd5c15fc. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZGLS2368532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43eca25814f541077970613bb3c3d9a252e4f279c7aceb4919cf29056e176d89. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/BXIV82238061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade5314f34fd9378437df68b90e77a628ffb6cd2efe881c5db5451d276194e14. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BXIV82210706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf995e000667e20c9a6d6942f050c6aa788d737a80af43d61e1ad5ae916fa8f57. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/BXIV82257601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1704e9a421a868acb94be2f8d930fe4b623329298a4f5212a59c2078e8ba66c0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZ5AB2285790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbec8ac37747b5a05b9e5d356521f99b0633b22fe1ee63564cf5f35d085e9bf8. 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/US7VG2207722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243fec782b1aedf4d5d90be31326aa063668c6d440b86973e90823a050438397. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BXIV82124712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9555e18d61699acbe980c0f1111f711d566524ba56dc1abf1c566027132ef0b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZNJW2143506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3e5ddcfe25d8a5aff57ce67b833c912a738fd8fc78ce8fef810788187b8bc2. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/BXIV82164920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c99824a1b26b73f4ad050dc702527acdff5aea0fe462642f2102a24bfaa0a9. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNJV2103383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fc3746bdbb811405dd7789abf99a801eb8dee8a40fb5a340841481cf65acb6. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/BXIV82125050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a58d988ab459384e93f28993ef2cf0a31eab3e7eae2bc56483c9c36cffbf2a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BXIV82153573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc494652a6ad8bdd94e01cd3ace8a80e5af6fb3b870403b33984e5913bdea884. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/BXIV82129665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fad11e4dfcbd6f21f7c05b71b66d1cdca720aaae78e42e4ca114a950ab0989. 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/BXIV82155165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0fab153f4ca1180c8e02bae9e70ad31186a3282160ad68b449fd697829453d. 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/QZNJX2024030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b3069cd1b62a171cf6ab463e0c2149fb666d6a0c77aff476a191092b3e1cc3. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZGLS2090142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab45da2140c382e15539432054c6b35f44ddbfe71873a7415d8bd5c0f5ee436. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZGLS2090145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe50e2145de07e92a9466254946e63a620bb051ffa3e4c8b80da8b230b43f7b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZGLS2090146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d7bac2466500d7cec3d84ffafc0fd0fd0f938b09a379b3d3226b9bbdeefdb6. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZGLS2090147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b98e2baa10880106b9665575c7d4e4bdfa12e7bb98b44486cbab62ff5b328ad. 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/QZGLM1947269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac99a329b5540003ce941c2ea69e366e70ffa95bb29b4762293a3fa7c53c220. 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/BXIV82287621.