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 0x49729b200347c7afe3d5b90e1197f50c48eb91ca1a767fcf6263992fe0be6600. 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/dec61bd0-9f75-4a5e-9a5c-96fa217efc5e.json and https://artists.proofprofile.net/proofs/artist/dec61bd0-9f75-4a5e-9a5c-96fa217efc5e.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 0x330cee3a4ddabd2924f3906e2377713532a2bc27945ec1157db48ec1da8a46c2. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/TCADX1881350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c44fa40272fbc89f3e03a9a5aa8f0de1d9d4b4035a5bef63c15fb4bffb4e81. 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/NL3AA2290010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa323ca09633e34d6f81bea0d600bd3fc1d22582ea3812d827107738212c702fd. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/TCAHO2318738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaeeff4e69dce8e22a7c599ad33ce3359de9f87a1e7f9a0b17ec495a42aa59d9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAHT2490281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c85da02fab357b554a446408ccef7d9b9c3753f30f23b637a35ee3a65493a58. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCAHZ2451847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0936d62bdaff0afbb17ad341c7ce9d30c6b75aaad69d7ee048697fee8879190d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAHY2412794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62fcb6ba3edfd2dde941c9ca7eb6342beaa1f9ae100c06640719a4891c27d369. 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/TCAIS2479380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce2486559c2fae27325697cee9e41c7736e0e1b4211badf46d97928769890a1. 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/TCAIS2479400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe303b9470148d301332f80cff7f66307f0f740ae49c779b920147751b948ae9c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TCAIT2479411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece18088e560f437060ee128b97d26aa74786ee13c9c81dce34fab83b391c262. 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/TCAIS2479427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb6717f50cbc453278923db5e6b144453ff7f521f5e76482f8fa19acb4e1dfb. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAIS2479437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b99860c145edac838e0055305a6a88486c2b825d6df9976e0a1932a9a0a49e. 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/TCAIS2479441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335aa0f25d566caf32ef5c8802ec83470ab345d41922c518542d9cd76faaf17b. 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/TCAIS2479455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aca1c6ad3e0a9b1c5d7e9ff4e1607c2ae07fddace88a27cf6b4bd421b19da49. 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/TCAIS2479463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bc1f9bbaf17a2735e7b2ad504ae7a22979baddbc21c7e193157e2bcb4cc9d5. 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/TCAIS2479469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99d022e73b15d62fb86f93148333a0a20ec3ce39853b670946b32dbd78b73ad. 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/TCAIS2479484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09590e43b223c4978be5aebb43d2c3527bbe6743497dcbf95bab7f1ce7285951. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/TCAIT2479493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05477d4d78c9fb6a28e4d54488cb141f8edc02be56b3d2c55378f227a1ec01b6. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZMER2532207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02594f9b34c500520f6878914cabd064d983c3110284d682738c6bcba5cc320. 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/BEEJ11900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02594f9b34c500520f6878914cabd064d983c3110284d682738c6bcba5cc320. 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/BEEJ11900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621e76014c4bd77786467b2c90bb14783fb1a0ae61c419a2fc297a154d266b91. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCADP1838129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc789ea3f495b7aca36bc599692785071270688e85cda98e17a05406114e231. 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/FR9W11905438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3d7f90e8a0cdc80952947e0ca1423c57891cdf7687e9602a322cc8dd1d94ab. 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/NLG662300859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3d7f90e8a0cdc80952947e0ca1423c57891cdf7687e9602a322cc8dd1d94ab. 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/NLG662300859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca2eb1d83c22d00303c67069c3bcd5e8c3b0f7c162582d5c043076482610fe5. 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/NL4DU2000440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fd82fb5d9a7de7da52f5d5a5be392fa44e8d34ed132ee2a5a2672238eb4d6f. 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/NLD322300151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb356fbf5c19a3a6e14d9bdd90d4634d78c786c15ddbc0da74ad54ad673408380. 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/NLD322300200.