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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2259b3df9bb67dc5f4fa50a7bc6462996755bc584305ce3008289ca973ae853d. 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/7196d929-108f-4cf4-87ed-9f163543a6cb.json and https://artists.proofprofile.net/proofs/artist/7196d929-108f-4cf4-87ed-9f163543a6cb.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2874c5767ed505e7a796201bf7320d9ffc326b0bec3dcbd200c700660b09a921. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAER2081727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a77eac1511ab5c6dd6d430cdc7099c0470074826da92e50387e2f321071954b. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCAER2081742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54bc1cef71779d11bd7c63cf90eaa0b3cd3a44aedbc05fd92305e522947701f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAER2081798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa614ea6e1998f3ed8862de9052e128ff175fbd9556e2e173f8456d7a3007fc35. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T16:00:53Z), 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/TCAER2081801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4534ae21a4987aca7240a69c6abcb6a470e2120cacbf6853e154601739e24a76. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/TCAER2081818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a51c6ffe2c129dcf8e66df4eb26dc2ffa3b9604bcd352097ef1dd603144e1c. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/TCAER2081837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1de369491895db93a8318acd00fda768c8497a954d56d2bed8b31fa88038b4. 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/TCAER2081868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003bb579e21b51635ffe3a4c38d758c6ab43452002269fb16f70d63012b35f96. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCAER2081871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f099d63f8876a74afa073e9ad02f4de2b7277db23420f0b241ac4b80fa33987. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/TCAER2081878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b729d1c3478a9835f3e031b0bec167f20bc2ec1cebaa1bdab7ed989e34cbf0. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TCAER2081892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b971c57b0ef30f7990a04bac5797a2897192644fa3d4c3f63efe9d97870413d. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/TCAER2081942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6746dff2e36bbc11ba2e1c065b8ca4c882220de329fdaf9d4a61aea365e35971. 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/TCAER2082142.
Christelijk Sliedrechts Mannenkoor Ichthus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bc11e52fc50e3155be86b38e32628e1a1ff6648d18086b247e4fb28c46393e. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/NLL6R1701401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fab19eaceaa09c533021b5cc9458eabe5bec7bbcceb448197ed5894c126742. 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/NLL6R1701402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd650663624060e00662b478df80a37471e7b65f3284c5736e659ed540922e2d7. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NLL6R1701404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc046333b09e703df6587fb642ed2b6a7865e4434b868490d170322be9bc817. 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/NLL6R1701409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe924e0e8d2c36242c39bfec8fb2655e28da9457ba6e7a93a9362d1f65929ab62. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLL6R1701411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a42723faa357c5a8acaca7e7fc571e269382fdc0790334f6fdaf699c0f3ee8e. 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/NLL6R1701416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a458998e5f42bdae6b93f2b9a97db862bf94a7decad84b0faaf26109e2d689. 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/NLL6R1701419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae37ca8533612b5b6f401b9d5f73f44b05d4825671bc0b4c648190127764545. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLL6R1701400.
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 0x7ac188cf40848b0f655239a8fc4a4bed68566c91205ba2d97bf6008f70b3b237. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLL6R1701403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded194fbe2b28a04781fc0d6527813a542dff6821e4d1baba0203415d3496abf. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NLL6R1701405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec370cd95ee98c7527fc1f9b2404fd704bac636f412ac28f3620f83d97b5f41. 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/NLL6R1701406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432a5fa8682d4a3fe10beb66e7cb11a86eda4090e2b430470c16b9386e0ca014. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLL6R1701407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0549784c3d3c135484f689ddc3dd0b5aedf499a33d82bdbc3971b5afabc2df5. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NLL6R1701408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4fcf16ca214e52e74418b732abbbb3f7a9342dbc71fee5a1a668a50d408e0e. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLL6R1701410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437c54f755831bafb3dd19d50d197ab256d5eee91326145c59b1f73ced2e0afe. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLL6R1701412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ac100c1414933b5b3cee82737fee91be9ada729b74bd808cfa14de32b6076b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/NLL6R1701413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cdf5e9e4b88fe7801eea5d0767b392e128207cfb7f44bfd416c7e0b466a93e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLL6R1701414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9109f7e2d9193ee58f7c8c863171f903ade32a6027e26b1ccae613d74bbd4c2b. 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/NLL6R1701415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556a5c0f338e3ddc5d797bd24e85e1c03cbb2af119a3b93d060862ceba7c4f09. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NLL6R1701417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafac653d73666b59ab0cf65addbc2cc365eec14b344177adb539855697d6d63a. 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/NLL6R1701418.