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 0x9f4614c016c67f7e63b67c7e42a328cfb5429ec35af3395800d8e68559e876b9. 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/05952141-9ba0-4469-a61d-b11361371d4d.json and https://artists.proofprofile.net/proofs/artist/05952141-9ba0-4469-a61d-b11361371d4d.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 0x4c2b4690961465047310135be58b900e9dbe173d5694e640a8a5df56b92e0019. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZNJW2431601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cef571fc72d10e08410433caf66e46b4702d0e82106a37f1bfee85f60a4934. 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/QZW9L2261580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf673a795090350cff4394ac292a2012ccbf1b174f60bfc93f295a13a4f77aaab. 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/QZNJW2319895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d66d4336afb87a9167bb86e7d4f4d60db37b533e32202a331fb2bbbd0b02375. 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/US7VG2392004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fd4455835ce7fe778850b0a30ab9f419836a0790c114a3d48475f98cdc0d69. 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/QZNJZ2270729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6860172e231f3869707a0e13493aa1484df8aedcc6fc8db6cf89d9cd2b81242. 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/QZHN82209829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fdbfabe534e2919b07c2d8ddfdee85be3893770e7f45e0b7fe892bba8c744b. 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/QZ5AB2477167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47923ca6d112a867ccfeae2053b1b395298b89ad8383c0ce606ab951e321615f. 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/SEYOK2337590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe692a4ab101c8b994eb079fa37b0ea27b80e83d59824fdf4a2039644595d4a43. 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/QZGLS2355031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6903ba3822e119daa6e9f4d331fe34eef59323c3e164a413b45829e0b26f6c3. 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/QZNJV2539769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3baa1e2da8e28b1820578084c000a108a4113be9780d4443fe55ba1f0f9ade. 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/US7VG2536870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ba9e2658a3b12717a17e4ee62d2d40f9ea968535856f059a2733d53c59c14f. 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/QZW9L2438574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3043a575f6d950daeb80709bec165f80d6195fda0bffdd9d211a2c9bac04d112. 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/QZW9L2410657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1b041b4cf74746120c611d1e2aec039aa10548c91d790df227e977b28add75. 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/QZTPX2487695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e62059ab2c31f1a8cbab101a5b47436708277563779e646dc2c16fd80a80f36. 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/QZNJZ2464402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9598bfa4b6caba0a1d1436010d26347b4161fb71cf71838d02963a4ae4b264. 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/US7VG2484454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53100b5c4391faa7858b1f92cfda991fff06180612ea7a96f84b416e0dfe76d7. 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/QZW9L2343823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e1f45fcdb1734461827c5e0b44c60e377024518d1b81bed8c26a5ca542f391. 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/QZW9L2343825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af9d7931fb0e83a3ed791b882a78df84b004f0c8b84b87c4af8c8fcd92403d0. 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/QZNJX2338609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615ccbbe6f48fc83a775063a7948e45d2c61af7aece5adec490c78df48c45e45. 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/QZ5AB2384079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603f99bb64c9f18b640a82c99ab44ae20dac6781e7a8dd5fadc803712a2d3067. 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/QZW9M2444100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf16cff0392eb2728063cb6052b5a6c07ec2f3d069625bf10bfc09370be17ecd. 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/QZW9M2444101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136af4f1aea62d329d0a481b86c5494071bd4494039f35e87f1a349fad6b0437. 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/QZW9M2444102.