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 0x7943d02f32db155ae05d6a5116f4fb7053a17f3163d617b610ba7a67b11d62aa. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e19973ab-e5db-47eb-96c7-25cd2c2abef6.json and https://artists.proofprofile.net/proofs/artist/e19973ab-e5db-47eb-96c7-25cd2c2abef6.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 0x6ade10e42f3b1e33afc78d6c3300c86f19c1031f854528e346c600644ae2a920. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/AEA2M2479928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac6d9d3fd59258c85aba94feae9c6db3de5513d66db960c6dd85c4b35fbcbd8. 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/AEA2M2479930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e505eefe514564703cb812290c06f52aca00d9c2ef60ed1eff6de0f698b485. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/AEA2M2479931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9b74252311c1833163a0d2c5a151a52f86aaac0d4e419b64361b1c1fe8d4ba. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/AEA2M2479932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f1dc22b376f564c7f07553a02e569a3a9f6c418753f69e2e85ea8a7288f792. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/AEA2M2479933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc06a615fc28472b287a7e64cc0050ba49c111411c1d58fde356fa1745e6e1f6. 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/QZHN72457964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579682e24611ddf6de87547f66958c506952c118bc1cd64c9665ce66fe5ceed1. 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/QZES62408895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a8f3ad8f394fe15ce5d1a9c278adda20f287261d3a0f77593bb399fca75fef. 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/QZWFG2372286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb273e01738f81c36c6522173ca16effa62a9f10291313cb383904d9cbb832ff6. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZWFG2372287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43aa270fa2698ed53714c39bc3cec2dc0d777e4356652b703711733fa7f61630. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZES72399867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488f8cdd2fdb4d22e40adae23dee369b105d98073ecc312d52b2808c8d6d7680. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/QZWFG2372288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8969f2dd32733502b9e38631f6aefdf0c3c75178cd666d264d08adac9212684f. 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/QZWFG2372289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf711f9713821adea7b6bd984db93efbf7ae16f04ce704628cab20361db613c52. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWFG2372290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43aa270fa2698ed53714c39bc3cec2dc0d777e4356652b703711733fa7f61630. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QZES72399867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df7df38a45191b371e241febb90cb4fda041ad49451076edcda5f8f00ad972a. 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/QZTVM2295809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda41a80bea06c8706d718ae930d33ee3067cb430716ed4d19212a9e4bdcc0e0. 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/QZTVM2295817.