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 0x399c1fce1e6c250d42e79d0c32356b348fae2bd5a5d0ea1a9fc4efa47283099b. 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/b1d8ed25-6348-4dc6-a15d-4a4006ec59c5.json and https://artists.proofprofile.net/proofs/artist/b1d8ed25-6348-4dc6-a15d-4a4006ec59c5.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 0x7df34d371c509c7a6a564eb64b1f91004cbd7b78ef398a1f1d59b2dfb1bf0dbb. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCADI1774725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674c24825777ea5cea01d13b4e1360764f97a98f43b774d7d7b0c4cc2595e89d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAFC2090786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d76da7c9051a792f02210aaad3c707705c675b12e82ea00f50ac2086ccaa31a. 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/USQX92105776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799c16b1ebda02967af024ed4fb348c0fe1821ed12942e18727ac0a9a8e7f148. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USQX92202122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799c16b1ebda02967af024ed4fb348c0fe1821ed12942e18727ac0a9a8e7f148. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/USQX92202122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d76da7c9051a792f02210aaad3c707705c675b12e82ea00f50ac2086ccaa31a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USQX92105776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2ea31ac4263a28bed3882f284164c7d8af4ed02500dc5c7596234d97bc0f8b. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/USQX92302706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa869d9d5575d295e8b537bcac0c1f5a2e1a539220901f6acaa8296fd2f43cde9. 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/USQX92400867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf290b13a983c4fb2aa509ca3b231348089f1e2694b4ead0ccc14333df623a275. 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/USQX92403197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a42078d06b7f470a77033075a468cbd1ebaaae284822f6389ae3e668636075d. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USQX92404130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9989b97143531cae288e12ff1b97b3b8dc7ce4128d8b554fb11e3b0b40f446. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USQX92404129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e971e920e98d97c78143a2a7f0f38179b1e026159772b6a8bbbec241f4916ee. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USQX92103256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15dfdaf97616b1f32ebd6fdd541cd78ae10dbaf4e5d54b4c43933be7826a140. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USQX92501099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e971e920e98d97c78143a2a7f0f38179b1e026159772b6a8bbbec241f4916ee. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USQX92103256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474213842619d3099b3e90849773ab226af8af0f5361d02a9e3d1c46ae7529f0. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USQX92300906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990f05fff43a114caffb106ec10f7fdbd4943d8439542d882aaed4b32632e7ad. 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/USQX92501861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db5f9310c9738b1030fc5cdd7fc949d8a72323b0ab081634aa482dca7779c1c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USQX92206375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2e2e325a4d9bd7882265a4487b6bbac60fe2948aa0c80a05be053f7a82f958. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFA2004442.