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 0xa88c91810c36bc960649f8f53dd7f1dd63325784e923c9c0e1c809a5907b21f3. 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/c4fba785-a6e4-4598-9b0f-cadc8a2e407d.json and https://artists.proofprofile.net/proofs/artist/c4fba785-a6e4-4598-9b0f-cadc8a2e407d.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 0xf46981b5e6cfc5e2544f0d26b390667878c1a2b5757cf65623146c900123ddf0. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZFZ52114300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe5e6e7878f73a2ea3ef52f779bc26615bfb2b22af8fac8be4af77f07c23d46. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZS672448627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66769672687f776f16a131650c7e979443427d83977f7914633071b03d725ad. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GBWUL2400300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5901e85302b355ad120b5de70d8654705af72d68b710cd37ed6f0fffcd580588. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USHM21582890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf23bb4d91319784fd1ade8d2a5c7c456ae43281f47b8bf2d54db1b535b42208. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES52020646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7267c056bc5ec5dd8d7ec4ebdfc6bd87c03190a9eb67b128dc725c162d5a5c3. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZNMU2163908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6369045891bf741cbcda38d05bb120c736a63e28744a1037ea8efcae5de49b. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/GBWUL2400289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938b142805633687b443df63564ec21551ccfd4b6a2e7342c6619fac828badf7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GBWUL2400310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36615e311da8fdcd6d4f85604ef891ea87612da747ea9cd199f35d90a4567b7c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMHL2466886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9b27d7b180f19fd6de2392c46d94b6fb8836caa6162ae231505cb00c010c58. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USHM21598002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee73d4987f5946abc5f50f42f6dcef6c10fa2444c37a0082b602d4b8c33c71f9. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZFZ52114296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57426a7484846917191eca3424948e386b5ab18e54bcac872063aca0e11090c1. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZNMU2163907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ac3b3af1efd8094749b02ba3ca1eb7bf85427af5fbd2d4cdfcc41d5e344c3b. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZNN22174447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f8f634a0b6136b452cd7983fd6bcc6ea2783d31672424f4f13ecc49d3acbdc. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZNMU2163910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac1767348833645501f9075626e594d8f15369bdb35026987509d7450e5fde3. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZES52019310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5e1ff24119fcf04a842be5c36149523ecc78b4ea9b1b63e4e001aa96cce081. 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/QZDA82126150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c80880c9cf7034d7bd8e9919ffa6885d9e6bcd2f1cc35f110f923f72aaef76. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZES52195549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8bdea6976780667dd402d11fbaa41af237a1a0790ccfd3ec6e001c962a21e6. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZDA82088917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772eac365cbd10b242780b0bfd793c8d2d9801dd92932a1686cad80c1af7ebed. 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/USLZJ2447665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2649360f1826b8fd4b9fb58d4b3194af7925f34c18e811d77c68c28bf0b372eb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHN32027847.