thumb|Best Friends by Romualdo Locatelli (1934) Friendship is a relationship of mutual affection between people. It is a stronger form of interpersonal bond than an "acquaintance" or an "association"
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 0xc294e57e97c1c733f844e4a6138085f7ae2d18e94060d29af58527abbf0fb02b. 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/e35fbc33-c392-43b3-a079-a3ba4f6889b6.json and https://artists.proofprofile.net/proofs/artist/e35fbc33-c392-43b3-a079-a3ba4f6889b6.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 0x416b0c9f7e0509cb01e9cd97731bff0f63b383513983907d95f641bbe8096652. 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/USHM21787140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619a610ba2c603cf0c749f09c139b3a2a91c48ae599ed3fc128d3e1817202514. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USHM21787146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0a0055c2e2991e739beab1e2bcfbb3afd72bef3a32066d9b08b492a06d7c21. 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/FR96X1936327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae1b237a39ef9404acd39d9ad4b8c0feb8a9b7fc5f0abd98a5183d2ed2e9151. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/FR96X1936330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a04ad8110ef67a9d530078019b330304ce6302a4d7c1bd3b687c8a735abb028. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FR96X1936332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fecd20c430ca6b233e5eb13686f5979630fd15ec20bddd308f3d42311ab3c2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USMRG2279704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd543d00ad41409b7e4d87c9b36de6b76cbb5ac87893e54fd0bdb271a729a6e. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/USMRG2279706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed79ba9edcbd438bf894378e58124080a6fa1d554095409eda2c58edd654353. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/USMRG2279707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49acf2014ca0281e0dce389cb94dec763709d63b3242840e91864d465c7a1bd5. 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/USMRG2279712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e855bf5f1b5854b4bfed501535764d5d169c000dc2eca87f2bcbf30361330f. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/USMRG2279713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f958f236ccc66d9bbdea1bae138d301dcf8e14b15f309b20f033fc0e848675f. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/USMRG2279714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f458db32ea916feebf4ea20a43c38b9e01ff37b211294432dff2d28d306a25. 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/USMRG2279715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43dc2edef517b883b08a89e8acc496d5f22c5adb0f52da935581f31f62164e94. 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/USMRG2279717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0bf7534aecac9795f27e54925d99a8e724e0d170dd0b1c4259df8c7778dc40. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USMRG2586104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa126b806491f7a6195b49560c21b438672b53760d8be2bec11f681e703a39994. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USMRG2586110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0bf7534aecac9795f27e54925d99a8e724e0d170dd0b1c4259df8c7778dc40. 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/USMRG2586104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96cd5c8e36a78e1704ae9320567f8afc02931edbd31f5889f61ebaa361d799e7. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USMRG2586101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce24e3c03a053b2b04dce0f9a02b6299dca943d5c21b4836e61bcf797be36af9. 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/USMRG2586102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a623473588beca5d573247fbf2cff55fed7e49d221bedb8cdf2269a620dcf1. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USMRG2586103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0bf7534aecac9795f27e54925d99a8e724e0d170dd0b1c4259df8c7778dc40. 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/USMRG2586104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42724571e4127bb359364351e691691659bc2e577d97ecc7db0d420cae4eb4c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USMRG2586105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b4b1d5ef820dee6a7d98dcf1e2b15123a90068c6980d60c7dbfc001f5533a7. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USMRG2586106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd418e9878f83f4c443aafa3f37439096f6e8c0902f63762b81366e5f1c0b808. 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/USMRG2586107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddedcd044babaae67224c7c88688e997a9277347a7ccca1259b21126a45e185. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USMRG2586108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6b01057cd947790380b2e44fac134c819858852180f1e2309ca48fd57f2f7f. 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/USMRG2586109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa126b806491f7a6195b49560c21b438672b53760d8be2bec11f681e703a39994. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USMRG2586110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2151a11452c55cef75668ca837a4987782b2cfc0bd22ad3db1966da9634b486a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USMRG2586111.
Chaos Outside (Free Association Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a79141082df5865172fb998ae21d2f28f1fb9a889514513d12faddc295c3285. 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/USMRG2586121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d82b40424b989ea44f728781bbcb084a7fe0dd8c435c77ba54723e47d7defd0. 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/USMRG2586122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23fb5f2284f7177d0a98f4ec91cd1a52204c8c9b13baed0e7b90ea2b53696b7. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/USMRG2586123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3846337459b1d72f3f33ce442f8495a7d910ff5776f2bd0e659c558f531fbaba. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USMRG2586124.